#include<bits/stdc++.h>
using namespace std;

const long long INF = 1LL << 60;
#define MOD 1000000007;

typedef long long ll;

#define writeln(n) cout<<n<<endl;
#define rep(i,n) for(int i=0; i<n; i++);

typedef pair<float, float> P;

typedef pair<string, int> Psi;

int main() {

	int a, b, c;
	cin >> a >> b >> c;

	for (int i = 1; i <= a + 10 * b; i++) {
		for (int j = 0; j <= a; j++) {
			int na = i - j;

			if (na <= 0) {

				if (11 <= i && i <= 19) {
					if (a - i + b + 1 == c) {
						writeln(i);
						return 0;
					}
				} else {
					if (a - i + b == c) {
						writeln(i);
						return 0;
					}
				}
			}
			for (int k = 1; k <= b; k++) {

				int nb = na/(10*k);

				int nnb=0;
				if(na%(10*k) !=0){
					nb++;

					nnb =(10-na%10);
				}

				if( a-j+ b-nb+nnb ==c){
					writeln(i);
					return 0;
				}

			}
		}
	}
	
	writeln("Impossible");
}