import java.util.*;
public class CalcPlusMinus {
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		String get = scan.next();
		int count = 0;
		
	    for(int i = 1; i<get.length(); i++){
			if(!Character.isDigit(get.charAt(i))){
					count = i;
			}
		}
	    
	    int a = Integer.parseInt(get.substring(0,count));
	    int b = Integer.parseInt(get.substring(count+1, get.length()));
	    
		if(get.indexOf("+") != -1){
			System.out.println(a-b);
		}
		if(get.indexOf("-") != -1){
			System.out.println(a+b);
		}
	}
}