import std.stdio, std.string, std.conv, std.algorithm;
import std.range, std.array, std.container, std.math, std.typecons;

immutable int mod = 10^^9 + 7;
immutable int inf = 20000;

string s;

void main() {
    s = readln.chomp;

    int sgn = 1, value, ans, op;
    value = inf;

    foreach (ch ; s) {
        if (ch == '+' || ch == '-') {
            if (value == inf) {
                sgn = (ch == '+' ? 1 : -1);
            }
            else {
                op = (ch == '+' ? -1 : 1);
                ans = sgn * value;
                value = inf;
                sgn = 1;
            }
        }
        else {
            if (value == inf) {
                value = ch - '0';
            }
            else {
                value = 10 * value + ch - '0';
            }
        }
    }

    ans += op * sgn * value;

    writeln(ans);
}

bool is_uruu(int x) {
    return !(x % 400) || (x % 100 && !(x % 4));
}