A, B, C = map(int, input().split())

def shrink_up(x):
    if x >= 10:
        return x//10 + x%10
    else:
        return x
nokori_moneys = {}
for a in range(A+1):
    for b in range(B+1):
        money = a + 10*b
        if money == 0:
            continue
        nokori = B-b + shrink_up(A-a)
        if nokori_moneys.get(nokori) is None:
            nokori_moneys[nokori] = set()
        nokori_moneys[nokori].add(money)

if nokori_moneys.get(C) is not None:
    print(min(nokori_moneys[C]))
else:
    print('Impossible')