#include <bits/stdc++.h>
using namespace std;
int main(){
    int n, k, year=1;
	double prices=200;
	cin >> n >> k;
	while ( n*year<prices )
	{
		year++;
		prices *= 1+0.01*k;
		if ( year>20 ) 
		{
			cout << "Impossible" << endl;
			break;
		}
	}
	if ( year<=20 ) cout << year << endl;
	return 0;
}