#! /usr/bin/env python3
a, b, c = map(int, input().split())

for i in range(1, b*10+a+1):
    for k in range(a+1):
        for j in range(b+1):
            if j*10 + k < i : continue
            t = j*10 + k - i
            tb = t//10
            ta = t - tb*10
            if ta + tb + (b-j) + (a-k) == c:
                print(i)
                exit()
print('Impossible')