import java.util.Scanner;
public class Yuki222{
	public static void main(String[] arg){
		Scanner sc = new Scanner(System.in);
		int x,y,res=0,i=0;
		String s;
		boolean plus=false;
		s = sc.next();
		if(s.charAt(i) == '-'){
			i++;
			x = (-1)*value(s,i);
			while('0'<= s.charAt(i) && s.charAt(i) <= '9')i++;
			if(s.charAt(i) == '+')plus = true;
			i++;
			if(s.charAt(i) == '-'){
				y = (-1)*value(s,i+1);
			}else{
				if(s.charAt(i) == '+')i++;
				y = value(s,i);
			}
		}else{
			if(s.charAt(i) == '+')i++;
			x = value(s,i);
			while('0'<= s.charAt(i) && s.charAt(i) <= '9')i++;
			if(s.charAt(i) == '+')plus = true;
			i++;
			if(s.charAt(i) == '-'){
				y = (-1)*value(s,i+1);
			}else{
				if(s.charAt(i) == '+')i++;
				y = value(s,i);
			}
		}
		if(plus){
			res = x - y;
		}else{
			res = x + y;
		}
		System.out.println(res);
	}
	public static int value(String s,int i){
		int temp = 0;
		while(i<s.length()){
			if('0'<= s.charAt(i) && s.charAt(i) <= '9'){
				temp = temp * 10 + Character.getNumericValue(s.charAt(i));
			}else{
				return temp;
			}
			i++;
		}
		return temp;
	}
}