#include <stdio.h>

int main()
{

    int m;
    double n;
    while (scanf("%d %lf", &m, &n) != EOF)
    {
        int price = 200;
        int award = m;
        int day = 0;
        if (m >= 200)
        {
            printf("1\n");
        }
        else
        {
            while (award < price && day < 21)
            {
                award += m;
                price += price * (n / 100);
                day++;
            }
            if (award >= price)
            {
                printf("%d\n", day + 1);
            }
            if (day >= 21)
            {
                printf("Impossible\n");
            }
        }
    }

    return 0;
}