#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c; cin>>a>>b>>c; for(int x=1000;x<=9999;x++){ if((x%a0)&&((x+1)%b0)&&((x+2)%c==0)){ cout<<x<<endl; return 0; } } cout<<"Impossible"; return 0; }