【題解】CPE 一顆星選集：20. Beat the Spread!

#include <iostream>
#define ll long long
using namespace std;

int main(){
    int S;
    ll D;
    while(cin >> S >> D){
        int now = S;
        while(D > 0){
            D -= now;
            if(D > 0) now++;
        }
        cout << now << 'n';
    }
}