import java.io.*;
import java.util.*;
import java.math.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		char[] c = br.readLine().toCharArray();
		int i = 0;
		
		boolean isNegative1 = false;
		if (c[i] == '+' || c[i] == '-') {
			isNegative1 = c[i++] == '-';
		}
		
		int num1 = 0;
		while ((c[i] + "").matches("[0-9]")) {
			num1 = num1 * 10 + (c[i++] - '0');
		}
		num1 = isNegative1 ? -num1 : num1;
		
		//out(num1);
		
		boolean isAdd = c[i++] == '-';
		
		//out(isAdd);
		
		boolean isNegative2 = false;
		if (c[i] == '+' || c[i] == '-') {
			isNegative2 = c[i++] == '-';
		}
		
		int num2 = 0;
		while (i < c.length) {
			num2 = num2 * 10 + (c[i++] - '0');
		}
		num2 = isNegative2 ? -num2 : num2;
		
		//out(num2);
		
		out(isAdd ? (num1 + num2) : (num1 - num2));
		
	}
}