###### tags: `CPE-數學計算`
# *The Hotel with Infinite Rooms*
## 題目：

#include<stdio.h>

int main(){
    long long S, D;//S是人數 D是想查的天數
    while(scanf("%lld %lld", &S, &D) != EOF){
        long long num = S;//天數統計
        while(num < D){
            S++;
            num = num + S;
        }
        printf("%lld\n", S);
    }
    return 0;
}