#include <iostream>
using namespace std;
int main(){
double n,x,m;
cin>>n>>x>>m;
int num=0;
while(x<n){
x=x+m;
num++;
if(m<n*0.01){
cout<<"Mission Impossible";
return 0;
}
n+=n*0.01;
}
cout<<num;
return 0;
}