A,B,C = map(int,input().split())
ans = 10**100

for price in range(1, A + B * 10 + 1):
  for b in range(B + 1):
    for a in range(A + 1):
      pay = a + b * 10
      if pay < price:
        continue
      sagaku = pay - price
      aa = sagaku % 10
      bb = sagaku // 10
      coin = ((A + B) - (a + b) + (aa + bb))
      if C == coin:
        ans = min(price,ans)
if ans == 10**100:
  ans = "Impossible"
print(ans)