coin1,coin10,remaining = map(int,input().split())
for price in range(1,coin1 + coin10 * 10 + 1):
    for c1 in range(coin1 + 1):
        for c10 in range(coin10 + 1):
            pay = c1 + c10 * 10
            if pay < price:
                continue
            back = pay - price
            b1 = back % 10
            b10 = back // 10
            if coin1 - c1 + b1 + coin10 - c10 + b10 == remaining:
                print(price)
                break
        else:
            continue
        break
    else:
        continue
    break
else:
    print("Impossible")