Problem : 16


#include <stdio.h>
  
int main () 
{
    long long sum = 0;
    
    for(int i = 0; i <= 1000000000; i++) {
        sum += i%5;
    }
    
    printf("%lld\n",sum);
    return 0;
}


// What's the output ?
// Source : http://www.youngprogrammer.com/
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