#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, year=1, k, money=1;
	double prices=200;
	cin >> n >> k;
	while ( money<prices )
	{
		year++;
		prices *= 1+1.0*k/100;
		money = n*year;
		if ( year>20 ) 
		{
			cout << "Impossible" << endl;
			break;
		}
	}
	if ( year<=20 ) cout << year << endl;
	return 0;
}