#include <stdio.h>


void sum(int k, ...)
{
    int *p = &k;
    int sum = 0;
    for (int i = 0; i < k; ++i){
       ++p;
       sum += *p;
    }
    printf("%d", sum);
}

int main()
{
   sum(3, 1, 2, 3);
   return 0;
}