Check 15 unique integers, C++ (vc++)

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#include <iostream>
#include <limits>

int main()
{
    int v_01, v_02, v_03, v_04, v_05, v_06, v_07, v_08, v_09, v_10, v_11, v_12, v_13, v_14, v_15;

std::cout << "Enter 15 values : " << std::endl;    
    
    if(true)
    {
        v_01 = 1; std::cout << v_01 << std::endl;
        v_02 = 2; std::cout << v_02 << std::endl;
        v_03 = 3; std::cout << v_03 << std::endl;
        v_04 = 4; std::cout << v_04 << std::endl;
        v_05 = 5; std::cout << v_05 << std::endl;
        v_06 = 6; std::cout << v_06 << std::endl;
        v_07 = 7; std::cout << v_07 << std::endl;
        v_08 = 8; std::cout << v_08 << std::endl;
        v_09 = 9; std::cout << v_09 << std::endl;
        v_10 = 10; std::cout << v_10 << std::endl;
        v_11 = 11; std::cout << v_11 << std::endl;
        v_12 = 12; std::cout << v_12 << std::endl;
        v_13 = 13; std::cout << v_13 << std::endl;
        v_14 = 14; std::cout << v_14 << std::endl;
        v_15 = 15; std::cout << v_15 << std::endl;
    }
    else
    {
        std::cin >> v_01;
        std::cin >> v_02;
        std::cin >> v_03;
        std::cin >> v_04;
        std::cin >> v_05;
        std::cin >> v_06;
        std::cin >> v_07;
        std::cin >> v_08;
        std::cin >> v_09;
        std::cin >> v_10;
        std::cin >> v_11;
        std::cin >> v_12;
        std::cin >> v_13;
        std::cin >> v_14;
        std::cin >> v_15;        
    }
    
    auto is_unique = [&](int &being_checked)
    {
        // Save the value
        int i = being_checked;
        
        // The value is currently being checked
        being_checked = std::numeric_limits<int>::min();
        
        bool unique = true;
        
        if(false) unique = unique;
        else if(i == v_01) unique = false;
        else if(i == v_02) unique = false;
        else if(i == v_03) unique = false;
        else if(i == v_04) unique = false;
        else if(i == v_05) unique = false;
        else if(i == v_06) unique = false;
        else if(i == v_07) unique = false;
        else if(i == v_08) unique = false;
        else if(i == v_09) unique = false;
        else if(i == v_10) unique = false;
        else if(i == v_11) unique = false;
        else if(i == v_12) unique = false;
        else if(i == v_13) unique = false;
        else if(i == v_14) unique = false;
        else if(i == v_15) unique = false;
        
        // Restore the original value when done
        being_checked = i;
        return unique;        
    };
    
    bool unique(is_unique(v_01));
    unique = unique && is_unique(v_02);
    unique = unique && is_unique(v_03);
    unique = unique && is_unique(v_04);
    unique = unique && is_unique(v_05);
    unique = unique && is_unique(v_06);
    unique = unique && is_unique(v_07);
    unique = unique && is_unique(v_08);
    unique = unique && is_unique(v_09);
    unique = unique && is_unique(v_10);
    unique = unique && is_unique(v_11);
    unique = unique && is_unique(v_12);
    unique = unique && is_unique(v_13);
    unique = unique && is_unique(v_14);
    unique = unique && is_unique(v_15);
    
    if(unique) 
    {
        std::cout << "15 values are unique" << std::endl;
    }
    else
    {
        std::cout << "15 values are NOT unique" << std::endl;        
    }
    
    return 0;    
}

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Compilation time: 1,73 sec, absolute running time: 0,33 sec, absolute service time: 2,07 sec