Codeforces Round #340 (Div. 2)

প্রবলেমটি পড়ুন এবং বুঝুন 

#include<stdio.h>

int main()
{
    long long int a;
    while((scanf("%lld",&a))==1)
    {
        int remain;
        remain=a%5;
        a=a/5;
        if(remain==0)
            printf("%lld\n",a);
        else
            printf("%lld\n",a+1);
    }
    return 0;
}