#include <bits/stdc++.h>
using namespace std;

int main() {
    int N, K;
    cin >> N >> K;
    int year = 1;
    double a = N;
    double b = 200;
    while (a < b) {
        year++;
        if (year > 20) {
            cout << "Impossible" << endl;
            break;
        }
        a += N;
        b *= (1 + K / 100.0);
    }
    if (a >= b) {
        cout << year << endl;
    }
    return 0;
}