#49 homework arithmetic*+
S=list(input())
i=0
a=[]
j=0
b=[]
while i<len(S):
    a.append("")
    while i<len(S) and S[i]!="*" and S[i]!="+":
        a[j]+=S[i]
#        print (a)
        i+=1
    if i<len(S):
        b.append(S[i])
#    print (b)
    j+=1
    i+=1
#print(a)
for i in range(len(a)):
#    print (i)
    a[i]=int(a[i])
d=a[0]
#print (d)
for i in range(len(a)-1):
    x=a[i+1]
    y=b[i]
    if y=="*":
        d+=x
    else:
        d*=x
print(d)