View Code of Problem 80

#include <stdio.h>
int main(){
  int n,i;
  while(scanf("%d",&n)!=EOF){
    int s=0;
    if(n==0)
      break;
    for(i=0;i<n;i++){
      s=(s+3)%i;
    }
    printf("%d\n",s+1);
  }
  return 0;
}