5.19

#include<bits/stdc++.h>
using namespace std;
int main(){
    long n, sum, i;
    while(cin >> n != EOF)
    {
        cout << "在之间的阶梯数为"  << endl;
        sum = 0;
        for (i = 7; i < =n; i ++)
             if(i % 7 == 0)
                  if(i % 6 == 5)
                      if(i % 5 == 4)
                          if(I %4 == 3)
                              if(i % 3 == 2)
                              {
                                  sum ++;
                                  cout << i;
                              }
        cout << n <<  " " << sum << endl;
    }
}