#include <iostream>
using namespace std;
int main() {
    int money = 0, n, k, year = 1;
    double house_money = 200;
    cin>>n >>k;
    for(; year <= 20; year++) {
        money += n;
        if(money >= house_money) {
            cout<<year;
            return 0;
        }
        house_money *= (1 + 0.01 * k);
    }
    cout<<"Impossible";
}