#include <bits/stdc++.h>

using namespace std;

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

string s;
stack <int> val;
stack <int> op;

bool isOperator( char c ) {
    if( strchr( "+-/*", c ) ) return true;
    return false;
}

int operatorPriority( char c ) {
    if( c == '(' || c == ')' ) return 0;
    if( c == '+' || c == '-' ) return 1;
    if( c == '*' || c == '/' ) return 2;
}

int operate( int a, int b, char op ) {
    if( op == '+' ) return a + b;
    if( op == '-' ) return a - b;
    if( op == '*' ) return a * b;
    if( op == '/' ) return a / b;
}

int main()
{
    fin >> s;

    int nr = 0;

    for( int i = 0; i < s.size(); ++i ) {
        if( isdigit( s[i] ) ) {
            nr = 0;

            while( i < s.size() && isdigit( s[i] ) ) {
                nr = nr * 10 + s[i] - '0';
                i++;
            }
            i--;

            val.push( nr );
            continue;
        }

        if( s[i] == '(' ) {
            op.push( '(' );
            continue;
        }

        if( s[i] == ')' ) {
            while( op.size() > 0 && op.top() != '(' ) {
                int a, b;
                char opr;
                int answer;

                b = val.top();
                val.pop();

                a = val.top();
                val.pop();

                opr = op.top();
                op.pop();

                answer = operate( a, b, opr );

                val.push( answer );
            }
            op.pop();
            continue;
        }

        if( isOperator( s[i] ) ) {
            while( op.size() > 0 && operatorPriority( op.top() ) >= operatorPriority( s[i] )) {
                int a, b;
                char opr;
                int answer;

                b = val.top();
                val.pop();

                a = val.top();
                val.pop();

                opr = op.top();
                op.pop();

                answer = operate( a, b, opr );

                val.push( answer );
            }

            op.push( s[i] );
        }
    }

    while( op.size() > 0 ) {
        int a, b;
        char opr;
        int answer;

        b = val.top();
        val.pop();

        a = val.top();
        val.pop();

        opr = op.top();
        op.pop();

        answer = operate( a, b, opr );

        val.push( answer );
    }

    fout << val.top();

    return 0;
}