#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("Yes");}else{puts("No");}
#define MAX_N 200005

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

    srep(i,1,a+b*10+1){
        rep(j,a+1){
            rep(k,b+1){
                if(j + k * 10 < i)continue;
                if(a - j + b - k + (j+k*10-i)%10 + (j+k*10-i)/10 == c){
                    cout << i << endl;
                    return 0;
                }
            }
        }
    }
    cout << "Impossible" << endl;
    return 0;
}