[백준] 1712번 : 손익분기점 - C++

https://www.acmicpc.net/problem/1712

#include <iostream>

using namespace std;

int main() {
    int a,b,c;
    cin>>a>>b>>c;
    int n=c-b;
    
    if(n<=0) cout<<-1;
    else cout<<a/n+1;
}