View Code of Problem 80

#include <stdio.h>

 int M = 3;

int main()
{
    int n, s ;
    while(scanf("%d", &n) != EOF && n)
    {
        s = 0;
        for (int i = 2; i <= n;i++)
            s = (s+M)%i;
        printf("%d\n", s+1);
    }
    return 0;
}