#include <bits/stdc++.h>
using namespace std;
char op = 0;
int acc = 0;
int cur = 0, pos = 0;
string s;
void red() {
switch(op){
case 0:
acc =cur;break;
case '+':
acc += cur;break;
case '*':
acc *= cur;
}
cur=0;
}
int main(){
cin >> s;
while (pos < s.length()) {
 if (s[pos] =='+') {
  red(); op = '+';
 } else if (s[pos] == '*') {
  red(); op = '*';
 } else {
  cur *= 10; cur += s[pos] -'0';
 }
 pos++;
}
red();
cout << acc << endl;
}