Lab 7 blackjack v1.1, C (gcc)

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//gcc 5.4.0

#include  <stdio.h>
//PRINT " Please input 2 integers"
//int x;
//int y;
//int sum;
//READ x and y
//sum=x+y;
//if(sum>21)
//    PRINT "You Lose\n";
//else
//{
//   while(sum<=21&&sum>=17) 
//   {
//       READ x
//       sum=x+sum;
//       continue;
//   }
//}
//printf("%d\n",sum);
//if(sum>21)
//    PRINT "You Lose :( \n";
//else
//    PRINT "YOU WIN!!!!! :)\n"
    
       
int main(void)
{
    printf("Please input 2 positive integers.\n");
int x;
int y;
int sum;
int sum1;
scanf("%d%d",&x,&y);
    if(x<0||y<0){
        printf("There are no negative cards :[");
        return 0;
                 }
sum=x+y;
//    printf("%d\n",sum);
if(sum>21)
    printf("%d\nYou Lose\n",sum);
else
{
   while(sum<17) 
   {
       x=0;
       
       scanf("%d",&x);
       if(x<0){
        printf("There are no negative cards :[");
        return 0;
               }
       if(x==0){
        printf("There are no  cards with 0 value :[");
        return 0;
                }
       sum1=sum;
       sum=x+sum;
       if(sum1==sum)
           break;
       printf("%d\n",sum);
    }
       if(sum>=17&&sum<=21){
           printf("%d\nYOU WIN\n",sum);
                           }
       else if(sum<=17){
           printf("%d\n Draw another card\n",sum); 
     
                            }
       else if(sum>21){
           printf("%d\nYOU LOSE\n",sum);
                      }

}
}

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Compilation time: 0.12 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0,35 sec