import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Scanner;

class Main {
	public static void main(String[] args) throws Exception {
		new Main().run();
	}
	
	void run() {
		Scanner sc=new Scanner(System.in);
		char[] cs=sc.next().toCharArray();
		int u=0,v=0;
		int su=1,sv=1;
		int p=0;
		if(cs[p]=='-') {
			++p;
			su*=-1;
		}
		while(cs[p]-'0'>=0&&9>=cs[p]-'0') {
			u=10*u+(int)(cs[p]-'0');
			++p;
		}
		if(cs[p]=='+')sv*=-1;
		++p;
		if(cs[p]=='-') {
			++p;
			sv*=-1;
		}
		while(p<cs.length&&cs[p]-'0'>=0&&9>=cs[p]-'0') {
			v=10*v+(int)(cs[p]-'0');
			++p;
		}
		System.out.println(su*u+sv*v);
		
	}
	
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
	
}