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

int main()
{
	int i;double n,k,sum=0,a = 200;
    cin >> n >> k;
    for (i = 1;i <= 20;i++)
    {
        sum += n;
        a = a*(1+k/100);
        if (sum > a)
        {
            cout << i;
            return 0;
        }
    }
    cout << "Impossible";
	return 0;
}