#include<bits/stdc++.h>
using namespace std;
 
int main(){
    string a; 
    int sum = 0;
    int state = 0; 
    cin >> a; 
    int len = a.size(); 
 
 
    for(int i = 0; i < len; i++){
        if(isdigit(a[i]) && state == 0){
            
            sum = sum * 10 + (a[i] - '0');
        } else if(isdigit(a[i]) && state != 0){
            
            if(state == 1){
                
                sum += a[i] - '0';
            } else if(state == 2){
                
                sum -= a[i] - '0';
            } else if(state == 3){
               
                sum *= a[i] - '0';
            }
            state = 0;
        } else {
            
            if(a[i] == '+'){
                state = 1;
            } else if(a[i] == '-'){
                state = 2; 
            } else if(a[i] == '*'){
                state = 3;
            }
        }
    }
 
    cout << sum;
    return 0;
}