import java.util.Scanner;
import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class yukicoder_222 {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		
		String str = stdIn.next();
		final String PLUS = "+";
		
		Pattern p = Pattern.compile("^[-]?[0-9]{1,6}");
		Matcher m = p.matcher(str);
		
		if (m.find()) {
			String matchstr =m.group();
			
			int n1 = Integer.parseInt(matchstr);
			int n2 = Integer.parseInt(str.substring(matchstr.length() + 1));
			
			int result = 0;
			
			if (str.substring(matchstr.length(),matchstr.length() + 1).equals(PLUS)) {
				if (str.substring(matchstr.length() + 1,matchstr.length() + 2) == "-") {
					result = n1 + Math.abs(n2);
				} else {
					result = n1 - n2;
				}
			} else {
				result = n1 + n2;
			}
			System.out.println(result);
			
		} else {
			System.out.println("no matches!");
		}
		
	}
}