#include <bits/stdc++.h>
using namespace std;

ifstream fin("evaluare.in");
ofstream fout("evaluare.out");

stack <int> nums;
stack <char> ops;
int pri[260];

void setpri();
int getNum(char*&s);
void eval(char* s);
void exec(char &op);

int main(){
    setpri();
    char s[100005];
    fin>>s;
    eval(s);
    fout<<nums.top();
    return 0;
}
void setpri(){
    pri['+'] = 1;
    pri['-'] = 1;
    pri['*'] = 2;
    pri['/'] = 2;
    pri['^'] = 3;
}

int getNum(char*&s){
    int num = 0;
    while(isdigit(*s)){
        num = num*10 + *s -'0';
        s++;
    }
    return num;
}

void eval(char* s){
    while(*s){
        if(isdigit(*s)){
            int x = getNum(s);
            nums.push(x);
        }else if(*s == '('){
            ops.push('(');
            s++;
        }else if(*s==')'){
            while(ops.top()!='('){
                exec(ops.top());
                ops.pop();
            }
            ops.pop();
            s++;
        }else{
            char op = *s;
            while(!ops.empty() && pri[ops.top()]>=pri[op]){
                exec(ops.top());
                ops.pop();
            }
            ops.push(op);
            s++;
        }
    }
    while(!ops.empty()){
        exec(ops.top());
        ops.pop();
    }
}

void exec(char &op){
    int rez = 0;
    int x1 = nums.top();
    nums.pop();
    int x2 = nums.top();
    nums.pop();
    switch (op){
        case '+':
            rez = x1+x2;
            break;
        case '-':
            rez = x2-x1;
            break;
        case '*':
            rez = x1*x2;
            break;
        case '/':
            rez = x2/x1;
            break;
        case '^':
            rez = pow(x2,x1);
            break;
        default:
            break;
    }
    nums.push(rez);
}