#include <iostream>  using namespace std; int main() {     int i,n;     int count=0;     int a=2;     int b=3;     while (cin>>n) {         for(i=4;i<=n;i++){             if(i<a+b){                 count++;             }             else{                 a=b;                 b=i;             }         }         cout<<count<<endl;         count=0;     a=2;     b=3;     }     return 0; }