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

#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; }