View Code of Problem 80

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 200


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