import java.util.*;

public class Main {
	public static void main (String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] arr = sc.next().toCharArray();
		StringBuilder[] sbs = new StringBuilder[2];
		boolean isPlus = true;
		int idx = 0;
		for (int i = 0; i < 2; i++) {
		    sbs[i] = new StringBuilder();
		    while (idx < arr.length) {
		        char c = arr[idx];
		        if (sbs[i].length() > 0 && (c == '+' || c == '-')) {
		            isPlus = c == '-';
		            idx++;
		            break;
		        }
		        sbs[i].append(c);
		        idx++;
		    }
		}
		int a = Integer.parseInt(sbs[0].toString());
		int b = Integer.parseInt(sbs[1].toString());
		int ans;
		if (isPlus) {
		    ans = a + b;
		} else {
		    ans = a - b;
		}
		System.out.println(ans);
   }
}