View Code of Problem 80

# include<stdio.h>
int main(void)
{
  int n,i,s;
  while(scanf("%d",&n)!=EOF)
  {
      if(n==0)
      break;
      s = 0;
      if(n==1||n==2)
      printf("%d\n",n);
      if(n>2)
      {
        for(i=2;i<=n;++i)
        {
          s = (s+3)%i;
        }
        printf("%d\n",s+1);
      }
  }
  return 0;
}