include<bits/stdc++.h>
using namespace std;  
int main(){           
    string s1;
    cin>>s1;
    int i,t = s1[0] - 48;
    for(i = 1;i < s1.length();i = i + 2)
    {
        if(s1[i] == '+'){
            t = t + s1[i + 1] - 48;
        }else if(s1[i] == '-'){
            t = t - (s1[i + 1] - 48);
        }else if(s1[i] == '*'){
            t = t * (s1[i + 1] - 48);
        }
    }
    cout<<t<<endl;
    return 0;
}
/**************************************************************
	Problem: 1122
	User: lijinkai
	Language: C++
	Result: Compile Error
****************************************************************/