import sys
input=lambda: sys.stdin.readline().rstrip()
a,b,c=map(int,input().split())
n=a+10*b
for i in range(1,n+1):
  for j in range(a+1):
    for k in range(b+1):
      if j+10*k<i:
        continue
      else:
        rem=(a-j)+(b-k)+(j+10*k-i)//10+(j+10*k-i)%10
      if rem==c:
        print(i)
        break
    else:
      continue
    break
  else:
    continue
  break
else:
  print("Impossible")