#include <bits/stdc++.h> using namespace std; double n,k,su,m,p; int main(){ cin>>n>>k; su=m=0; p=200; while(n>=pk/100.0&&m<=20){ su+=n; m++; if(su>=p){ cout<<m<<endl; break; } p=p(1.0+k/100.0); } if(n<p*k/100.0||m>20){ cout<<"Impossible"<<endl; } return 0; }