#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<pii,int> ppii;
typedef pair<int,pii> pipi;
typedef pair<ll,ll> pll;
typedef pair<ll,pll> plpl;
typedef tuple<ll,ll,ll> tl;
ll mod=1000000007;
ll inf=1000000000000000000;
#define rep(i,m,n) for(int i=m;i<n;i++)
#define rrep(i,n,m) for(int i=n;i>=m;i--)
ll lmax(ll a,ll b){
    if(a<b)return b;
    else return a;
}
ll lmin(ll a,ll b){
    if(a<b)return a;
    else return b;
}
int dh[4]={-1,1,0,0};
int dw[4]={0,0,1,-1};
int main(){
    int a,b,c;cin>>a>>b>>c;
    if(a+b<=c){
        cout<<"Impossible"<<endl;
        return 0;
    }
    rep(i,1,a+10*b+1){
        rep(j,0,a+1){
            rep(k,0,b+1){
                if(j+10*k<i)continue;
                int u=(j+10*k)-i;
                int otu=u/10+u%10;
                int kouka=otu+a-j+b-k;
                if(kouka==c){
                    cout<<i<<endl;
                    
                    return 0;
                }
            }
        }
    }
    cout<<"Impossible"<<endl;
}