#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 10000000



int main(){
	
	int A,B,C;
	cin>>A>>B>>C;
	
	for(int i=1;i<=(A+B*10)*100;i++){
		for(int j=0;j<=A;j++){
			for(int k=0;k<=B;k++){
				if(j+(k*10)<i)continue;
				int a = A-j,b = B-k;
				int c = (j+k*10)-i;
				int sum = a + b + c%10 + c/10;
				if(sum==C){
					cout<<i<<endl;
					return 0;
				}
			}
		}
	}
	
	cout<<"Impossible"<<endl;
	
    return 0;
}