View Code of Problem 80

#include <stdio.h> 
int main() 
{ 
int i;
    int n, s = 0; 
    int M = 3; 
    while(scanf("%d", &n)!=EOF){

		if(n==0)
			break;
 	   for (i = 2; i <= n; ++i) 
        s = (s+M)%i; 
    printf("%d\n", s+1);
	    }  
    return 0; 
}

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