#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;

ll gcd(ll a, ll b) {
    if (a < b)swap(a, b);
    if (b == 0)return a;
    return gcd(b, a % b);
}
int lcm(int a, int b) {
    return a * b / gcd(a, b);
}


int main()
{

    int Q;
    Q = 1;
    //cin >> Q;
    
    while (Q--) {
        int a, b, c;
        cin >> a >> b >> c;
        int ans = 100000;
        for (int i = 1; i <=a+b*10 ; i++) {
            for (int A = 0; A <= a; A++) {
                for (int B = 0; B <= b; B++) {
                    if (A + 10 * B < i)continue;
                    int p = A + 10 * B;
                    int r = p-i;
                    int d = a - A + r % 10 + b - B + r / 10;
                    if(c==d)ans = min(ans, i);
                }
            }
            
            
        }
        if (ans == 100000)cout << "Impossible";
        else cout << ans;
    }
    
    return 0;
}