UVa : 10170


#include <stdio.h>
#include <math.h>

int main ()
{
    int s;
    double d;

    while ( scanf ("%d %lf", &s, &d) != EOF ) {
        int below = (s * (s - 1)) / 2;
        d += below;
        d *= 2;
        double n = ceil ((sqrt (1 + 4 * d) - 1) / 2.0);
        printf ("%0.lf\n", n);
    }

    return 0;
}
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