#include <bits/stdc++.h>
using namespace std;

int oturi(int a, int b){
    int tmp = b - a;
    return tmp / 10 + tmp % 10;
}

int main(){
    int a, b, c;
    cin >> a >> b >> c;

    int ans = INT_MAX;
    for(int i = 0;i <= a;i++){
        for(int j = 0;j <= b;j++){
            for(int k = 1;k <= INT_MAX;k++){
                if(k > i + 10*j){
                    break;
                }else if((a-i) + (b-j) + oturi(k, i+10*j) == c){
                    ans = min(ans, k);
                }
            }
        }
    }

    if(ans == INT_MAX){
        cout << "Impossible" << endl;
    }else{
        cout << ans << endl;
    }

    return 0;
}