/* -*- coding: utf-8 -*-
 *
 * 825.cc:  No.825 賢いお買い物 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int a, b, c;
  scanf("%d%d%d", &a, &b, &c);

  int maxp = a + 10 * b;
  for (int p = 1; p <= maxp; p++)
    for (int u = 0; u <= a; u++)
      for (int t = 0; t <= b; t++) {
	int q = u + 10 * t;
	if (q >= p) {
	  int g = q - p;
	  int a0 = a - u + g % 10;
	  int b0 = b - t + g / 10;
	  if (a0 + b0 == c) {
	    printf("%d\n", p);
	    return 0;
	  }
	}
      }

  puts("Impossible");
  return 0;
}