#include <iostream>

using namespace std;

int main() { int k,m=1; double a=200.0; double n,s=0; cin>>s>>k; n=s; while(n<a){ m++; a=a/100*k+a; n=n+s; if(m>20){ break; } } if(n>=a && m<=20){ cout<<m; } else{ cout<<"Impossible"; } return 0; }