#include <bits/stdc++.h>
#define rep(i, n) for(int i=0; i<(n); ++i)
#define rep1(i,n) for(int i=1; i<=(n); ++i)
#define repi(i,a,b) for(int i=a; i<=(b); ++i)
#define ALL(obj) (obj).begin(), (obj).end()
#define pb push_back
#define sz(v) (int)v.size()
#define UNIQUE(v) v.erase( unique(v.begin(), v.end()), v.end() );
using ll = long long;
using namespace std;
struct aaa{aaa(){ cin.tie(0); ios::sync_with_stdio(0); cout<<fixed<<setprecision(20);};}aaaaaaa;
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};

int a,b,c;

int main(){
    cin >> a >> b >> c;
    if(a+b <= c){
        cout << "Impossible" << endl;
        return 0;
    }
    vector<int> pr;
    rep1(i,10000){
        rep(j,a+1){
            rep(k,b+1){
                int h = a + b - j - k;
                int pay = j + 10*k;
                if((pay - i < 10) && (pay - i) >= 0 && (h + pay - i == c)) pr.pb(i);
                else if(pay - i >= 10 && h + (pay-i)/10 + (pay-i)%10 == c) pr.pb(i);
            }
        }
    }
    sort(ALL(pr));
    cout << pr[0] << endl;
}