633B - A Trivial Problem - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;


int main() {
    int m;
    cin >> m;
    int c2 = 0, c5 = 0;
    int i = 2;
    while(1) {
        int t = i;
        while(t%2==0) {
            t /= 2;
            c2++;
        }
        t = i;
        while(t%5==0) {
            t /= 5;
            c5++;
        }
        //cout << c2 << " " << c5 << endl;
        if(c2>m and c5>m) {
            cout << 0;
            return 0;
        }
        if(min(c2,c5)==m) {
            cout << 5 << endl;
            for(int j = 0; j < 5; j++) {
                cout << i++ << " ";
            }
            return 0;
        }
        i++;
    }
}