TheInfiniteHotelRoom

#include<stdio.h>

int main()
{
    int s, d;
    while(scanf("%d %d", &s, &d) != EOF){
        int a[1000], index = 0;
        for(int i=1; i<=d; i++){
            for(int j=1; j<=s; j++){
                a[index] = s;
                index++;
            }
            s++;
        }
        printf("%d\n", a[d-1]);
    }
    return 0;
}