View Code of Problem 80

#include<stdio.h>
#include<string.h>

int main()
{
    int i,n,k ;
    while(scanf("%d",&n) != EOF)
    {
        if(!n)
            break;
        k = 0;
        for(i = 2;i <= n;i++)
            k = (k+3)%i;
        printf("%d\n",k+1);
    }
    return 0;
}