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

int main(){
    int n,b;
    double c=200;
    cin >>n>>b;
    int a=n;
    for(int i = 2; i <= 21; ++i){
        c=c+c*b/100;
        a=a+n;
        if(a>=c){
        	cout<<i<<endl;
        	return 0;
		}
    }
    cout<<"Impossible"<<endl;
    return 0;
}