homework/666/01.cpp

#include<iostream>
using namespace std;

int main(){
    
    int t=0;
    int h=0;
    
    while(h<=17){
        t++;
        h+=3;
     
        if(h>=17)
            break;
    
        t++;
        h--;
    }

    cout<<"需要"<<t<<"分钟"<<endl;
    return 0;
}