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

for i in range(1,A+B*10+1):
    for j in range(A+1):
        for k in range(B+1):
            if i <= j+k*10:
                rm = (j+k*10)-i
                a = rm//10 + rm%10
                if a+(A-j)+(B-k) == C:
                    print(i)
                    exit()
print('Impossible')