#include <cstdio>
#include <cstring>
#include <iostream>
#include <string>
#include <cmath>
#include <bitset>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <algorithm>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <random>
#include <cassert>
#include <fstream>
#define popcount __builtin_popcount
using namespace std;
typedef long long int ll;
typedef pair<int, int> P;

int main()
{
    int a, b, c; cin>>a>>b>>c;
    int ans=1e9;
    for(int i=0; i<=a; i++){
        for(int j=0; j<=b; j++){
            for(int x=1; x<=i+10*j; x++){
                if((i+10*j-x)%10+(i+10*j-x)/10+a-i+b-j==c) ans=min(ans, x);
            }
        }
    }
    if(ans==1e9) cout<<"Impossible"<<endl;
    else cout<<ans<<endl;
    return 0;
}