C++ 代码

#include<iostream>
using namespace std;
int n,res;

int main(){
    cin >>n;
    while(1){
        if(n>=50){
            res+=7;
            n-=50;
        }
        else if(n>=30){
            res+=4;
            n-=30;
        }
        else{
            res+=n/10;
            break;
        }
    }
    cout <<res<<endl;
    return 0;
}