import java.util.Scanner;
public class House {
public static void main(String[] args) {
System.out.println("请输入 N M");
Scanner s = new Scanner(System.in);
String[] a;
boolean i = true;
int m;
int n;
int year = 0;
while(i){
String ss = s.nextLine();
a = ss.split(" ");
m = Integer.parseInt(a[0]);
n = Integer.parseInt(a[1]);
if((m > 50)||(m < 10)||(n > 20)||(n < 1)){
i = false;
}
if((year <= 20) && (m*year >= 200*Math.pow(1+n/100, year))){
System.out.println(year);
}
else{
System.out.println("Impossible");
}
}
}
}