#include <bits/stdc++.h>
using namespace std;
int main(){
	double N,K,price=200,ans=0,sum=0;
	cin>>N>>K;
	sum=N;
	for(int i=1;i<=20;i++){
		ans=i;
		sum+=N;
		//cout<<sum<<" "<<price<<endl;
		price*=(1+K/100);
		if(sum>=price){
			cout<<ans+1;
			return 0;
		}
	}
	cout<<"Impossible";
	return 0;
}