题解

#include<iostream>
using namespace std;
int main(){
    int n,k,x=200,i=1;
    cin>>n>>k;
    int sum=n;
    while(x>sum){
        x*=1+k/100.0;
        sum+=n;
        i++;
        if(i>20){
            cout<<"Impossible";
            return 0;
        }
    }
    cout<<i;
    return 0;
}