A,B,C = map(int,input().split())
ans = 10**100
for i in range(A + 1):
  for j in range(B + 1):
    if (A + B - C) == (i + j - (i - i % 10) // 10):
      ans = min(ans, i % 10 + 10 * j)
if ans == 10**100 or ans == 0:
  ans = "Impossible"
print(ans)