f=raw_input()
f+="*"
prev=1
op='+'
cur=0
for c in f:
    if c=='*' or c=='+':
#        print prev,op,cur
        if op=='*':
            prev=prev+cur
        else:
            prev=prev*cur
        op=c
        cur=0
    else:
        cur*=10
        cur+=int(c)
print prev