#include <bits/stdc++.h>

using namespace std;

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

char infix[100005];
queue<char> postfix;
stack<char> semn;

inline int priority(char x) {
    switch(x) {
        case '*': return 2;
        case '/': return 2;
        case '%': return 2;
        case '+': return 1;
        case '-': return 1;
        default: return 0;
    }
}

inline bool isDigit(char x) {
    return (x>='0'&&x<='9');
}

void infixToPostfix() {
    char* i = &infix[0];
    while(*i!='\0') {

        while(*i==' '||*i=='\t') i++;

        if(isDigit(*i)) {
            postfix.push(*i);
            i++;
            continue;
        }

        postfix.push(' ');
        if(*i=='(') {
            semn.push(*i);
            i++;
            continue;
       }

       if(*i==')') {
            while(semn.top()!='(') {
                postfix.push(semn.top());
                semn.pop();
            }
            semn.pop(); //scoatem pe '('
            i++;
            continue;
       }

       if(!isDigit(*i)) {
            if(semn.empty()) {
                semn.push(*i);
                i++;
                continue;
            }
            while(semn.size()&&priority(semn.top())>=priority(*i)) {
                postfix.push(semn.top());
                semn.pop();
            }
            semn.push(*i);
            i++;
       }
    }
    postfix.push(' ');
    for(;semn.size();semn.pop()) postfix.push(semn.top());
}

inline int doMath(int x,int y,char op) {
    switch(op) {
        case '+':return x+y;
        case '-':return x-y;
        case '*':return x*y;
        case '/':return x/y;
        case '%':return x%y;
    }
}

int main()
{
    fin>>infix;
    infixToPostfix();
    int buffer=-1;
    stack<int> aux;
    for(;postfix.size();postfix.pop()) {
        char cChar = postfix.front();
        if(isdigit(cChar)) {
            if(buffer==-1) buffer=0;
            buffer=buffer*10+(cChar-'0');
            continue;
        }
        else if(cChar==' ') {
            if(buffer==-1) continue;
            aux.push(buffer);
            buffer=-1;
            continue;
        }
        else {
            int nr1=aux.top();
            aux.pop();
            int nr2=aux.top();
            aux.pop();
            aux.push(doMath(nr2,nr1,cChar));
            continue;
        }
    }
    fout<<aux.top();
    return 0;
}