View Code of Problem 80

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

		  }
         
    }