124. The Hotel with Infinite Rooms

int D_size(int S, int D);


int D_size(int S, int D) {
    int people = 0;
    while (1) {
        if (D <= (people + S)) {
            return S;
            break;
        }
        else {
            people += S;
            S += 1;
        }
    }
}


int main() {
    int S, D;
    scanf("%d %d", &S, &D);
    printf("%d", D_size(S, D));
    return 0;
}