import java.util.*;
class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		char[] in = sc.next().toCharArray();
		StringBuilder a = new StringBuilder();
		boolean startA = true;
		boolean startB = false;
		StringBuilder b = new StringBuilder();
		boolean opPlus = false;;
		for(int i = 0; i < in.length; i++) {
			if(i != 0 && !startB && (in[i] == '+' || in[i] == '-')) {
				if(in[i] == '+') {
					opPlus = true;
				}
				startB = true;
				continue;
			}
			if(!startB)
			a.append(in[i]);
			else {
				b.append(in[i]);
			}
		}
		
		
		
		int A = Integer.parseInt(a.toString());
		int B = Integer.parseInt(b.toString());
		
		
		System.out.println(opPlus?(A-B):(A+B));
		
		
		
		
	}
	
	static class Data {
		int[][] mapA;
		int[][] mapB;
		int count;
		
		Data(int[][] a, int [][] b , int count) {
			mapA = a;
			mapB = b;
			this.count = count;
		}
	}
}