import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No0222 {
    
    static final Scanner in = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve() {
        String s = in.next();
        int cnt = 0;
        for (int i=0; i<s.length(); i++) {
        	if (s.charAt(i) == '-' || s.charAt(i) == '+') {
        		cnt++;
        	}
        }

        if (cnt == 1) {
        	int ptr = 0;
        	int x = 0;
        	while (s.charAt(ptr) != '-' && s.charAt(ptr) != '+') {
        		x *= 10;
        		x += s.charAt(ptr) - '0';
        		ptr++;
        	}

        	boolean f = s.charAt(ptr) == '+';

        	int y = 0;
        	while (++ptr < s.length()) {
        		y *= 10;
        		y += s.charAt(ptr) - '0';
        	}

        	out.println(f?(x-y):(x+y));
        }

        if (cnt == 2 && '0' <= s.charAt(0) && s.charAt(0) <= '9') {
        	int ptr = 0;
        	int x = 0;
        	while (s.charAt(ptr) != '-' && s.charAt(ptr) != '+') {
        		x *= 10;
        		x += s.charAt(ptr) - '0';
        		ptr++;
        	}

        	boolean f = s.charAt(ptr) == '+';
        	boolean f2 = s.charAt(++ptr) == '+';

        	int y = 0;
        	while (++ptr < s.length()) {
        		y *= 10;
        		y += s.charAt(ptr) - '0';
        	}
        	if (!f2) y = -y;

        	out.println(f?(x-y):(x+y));
        }

        if (cnt == 2 && (s.charAt(0) == '+' || s.charAt(0) == '-')) {
        	int ptr = 0;
        	boolean f1 = s.charAt(ptr++) == '+';
        	int x = 0;
        	while (s.charAt(ptr) != '-' && s.charAt(ptr) != '+') {
        		x *= 10;
        		x += s.charAt(ptr) - '0';
        		ptr++;
        	}
        	if (!f1) x = -x;

        	boolean f = s.charAt(ptr) == '+';

        	int y = 0;
        	while (++ptr < s.length()) {
        		y *= 10;
        		y += s.charAt(ptr) - '0';
        	}

        	out.println(f?(x-y):(x+y));
        }

        if (cnt == 3) {
        	int ptr = 0;
	    	boolean f1 = s.charAt(ptr++) == '+';
	    	int x = 0;
	    	while (s.charAt(ptr) != '-' && s.charAt(ptr) != '+') {
	    		x *= 10;
	    		x += s.charAt(ptr) - '0';
	    		ptr++;
	    	}
	    	if (!f1) x = -x;

	    	boolean f = s.charAt(ptr) == '+';
	    	boolean f2 = s.charAt(++ptr) == '+';

	    	int y = 0;
	    	while (++ptr < s.length()) {
	    		y *= 10;
	    		y += s.charAt(ptr) - '0';
	    	}
	    	if (!f2) y = -y;

	    	out.println(f?(x-y):(x+y));	
        }
    }

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(Arrays.deepToString(o));}
}