#include <stdio.h>

int main() {
    int n, k;
    scanf("%d %d", &n, &k);
    double money = 0;
    double housePrice = 200;
    int year;
    for (year = 1; year <= 20; year++) {
        money += n;
        housePrice *= (1 + k / 100.0);
        if (money >= housePrice) {
            printf("%d\n", year);
            return 0;
        }
    }
    printf("Impossible\n");
    return 0;
}