A,B,C=map(int,input().split())
num_ans=[]
for i in range(-10,A+1):
    for j in range(-10,B+1):
        if ((A-i)+(B-j))==C:
            num_ans.append([i,j])
ans=[]
for i,j in num_ans:
    if (i+10*j)>0:
        ans.append(i+j*10)
if len(ans)==0:
    print("Impossible")
else:
    print(min(ans))