S = input()
A = []
B = []
K = ''
for c in S:
    if c != '*' and c != '+':
        K += c
    else:
        A.append(int(K))
        if c == '*':
            B.append('+')
        else:
            B.append('*')
        K = ''
A.append(int(K))
N = len(B)
ans = A[0]
for i in range(N):
    ans = eval(f'{ans}{B[i]}{A[i+1]}')
print(ans)