#include <iostream>
using namespace std;

int main() {
    int N, K;
    cin >> N >> K;
    
    double sum = N;  // 第一年存款
    double price = 200;
    int year = 1;
    
    while (sum < price && year <= 20) {
        year++;
        sum += N;
        price *= (1 + K / 100.0);
    }
    
    if (year <= 20) {
        cout << year << endl;
    } else {
        cout << "Impossible" << endl;
    }
    
    return 0;
}