#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cctype>
#include <algorithm>
using namespace std;
const int NMAX=100005;
int op[NMAX],polo[NMAX];
int top_op,top_polo;
int pr(char ch)
{
    switch(ch)
    {
        case '+': return 1;
        case '-': return 1;
        case '*': return 2;
        case '/': return 2;
        default: return 0;
    }
}
void eval()
{
    if(op[top_op]=='+')
        polo[top_polo-1]=polo[top_polo-1]+polo[top_polo];
    if(op[top_op]=='-')
        polo[top_polo-1]=polo[top_polo-1]-polo[top_polo];
    if(op[top_op]=='*')
        polo[top_polo-1]=polo[top_polo-1]*polo[top_polo];
    if(op[top_op]=='/')
        polo[top_polo-1]=polo[top_polo-1]/polo[top_polo];
    top_op--;
    top_polo--;
}
int main()
{
    freopen("evaluare.in","r",stdin);
    freopen("evaluare.out","w",stdout);
    int nr;
    char ch;
    scanf("%c",&ch);
    while(isdigit(ch) || ch=='+' || ch=='-' || ch=='*' || ch=='/' || ch=='(' || ch==')')
    {
        if(isdigit(ch))
        {
            nr=0;
            while(isdigit(ch))
            {
                nr=nr*10+(ch-'0');
                scanf("%c",&ch);
            }
            polo[++top_polo]=nr;
        }
        else
        {
            if(top_op==0 || ch=='(' || pr(op[top_op])<pr(ch))
               op[++top_op]=ch;
            else
            {
                if(ch==')')
                {
                    while(op[top_op]!='(')
                        eval();
                    top_op--;
                }
                else
                {
                    while(pr(op[top_op])>=pr(ch))
                        eval();
                    op[++top_op]=ch;
                }
            }
            scanf("%c",&ch);
        }
    }
    while(top_op)
        eval();
    printf("%d",polo[1]);
    fclose(stdin);
    fclose(stdout);
    return 0;
}