55求调

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n,a,b;
    cin>>n>>a>>b;
    int ans=(b-a+sqrt(a*a+b*b-2*a*b+4*n*b))/(2*b)+1;
    if((int)(ans)==ans){
        ans--;
    }
    cout<<ans+1;
}