S=input()
T=""
X=[]
for s in S:
    if s!="+"and s!="*":
        T+=s
    else:
        T+=" "
        X+=[s]
T=list(map(int,T.split()))
ANS=T[0]
for i in range(len(X)):
    if X[i]=="+":
        ANS*=T[i+1]
    else:
        ANS+=T[i+1]
print(ANS)