#include <iostream>
#include <vector>
using namespace std;

#define REP(i,s,e) for (int i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)

int main() {
    string s;
    cin >> s;
    int x, y, tmp;
    auto p = s.begin();

    x = 1;
    if (*p == '+')
        p++;
    else if (*p == '-') {
        x = -1;
        p++;
    }
    for (tmp = 0;'0' <= *p && *p <= '9'; p++)
        tmp = tmp * 10 + *p - '0';
    x *= tmp;
    y = 1;
    if (*p == '+') {
        y = -1;
        p++;
    }
    else if (*p == '-')
        p++;
    if (*p == '+')
        p++;
    else if (*p == '-') {
        y = -y;
        p++;
    }
    for (tmp = 0;'0' <= *p && *p <= '9'; p++)
        tmp = tmp * 10 + *p - '0';
    y *= tmp;

    cout << x + y << endl;

    return 0;
}