#include <iostream>
#include <stdio.h>
#include <cstring>
#include <math.h>
#include <algorithm>
#include <vector>
#define rep(i,n) for(int i=0;i<n;i++)
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define ll long long
#define LL long long
#define mass 1000000007
using namespace std;


int main(){
	
	char a[13];
	cin>>a;

	int i=0;
	int f1=1;
	int f2=1;
	int n1=0;
	int n2=0;
	if(a[0]==43){
		i++;
	}else if(a[0]==45){
		f1=-1;
		i++;
	}
	while(a[i]>47){
		n1*=10;
		//cout<<int(a[i])-48<<endl;
		n1+=int(a[i])-48;
		i++;
	}
	int k;
	if(a[i]==43){
		k=-1;
	}else{
		k=1;
	}
	i++;

	if(a[i]==43){
		i++;
	}else if(a[i]==45){
		f2=-1;
		i++;
	}
	while(a[i]>47){
		n2*=10;
		//cout<<int(a[i])-48<<endl;
		n2+=int(a[i])-48;
		i++;
	}

	//cout<<n1<<endl;
	//cout<<n2<<endl;

	cout<< f1*n1 + k*f2*n2 <<endl;

	return 0;
	

}