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

int main()
{
	int A, B, C;
	cin >> A >> B >> C;

	int ans = 0;
	int maxg = A + B * 10;
	for( int g = 1; g <= maxg; g++ ) {
		for( int a = 0; a <= A; a++ ) {
			for( int b = 0; b <= B; b++ ) {
				int pay = a + b * 10;
				int change = pay - g;
				if( change < 0 ) continue;
				int c = change / 10 + change % 10;
				c += A - a + B - b;
				if( c == C ) {
					ans = g;
					break;
				}
			}
			if( ans ) break;
		}
		if( ans ) break;
	}

	if( ans == 0 ) cout << "Impossible" << endl;
	else cout << ans << endl;
}