#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
	string S;
	cin>>S;
	char *pStr=(char*)S.c_str();
	char ch1='+',ch2='+';
	string s1,s2;
	if (pStr[0]=='-' ){
		ch1='-';
		pStr++;
	}
	char op=' ';
	while (*pStr!='\0'){
		if (op==' '){
			if (*pStr>='0' && *pStr<='9'){
				s1.push_back(*pStr++);
			}else{
				op=(*pStr++);
			}
			continue;
		}
		if (*pStr=='-'){
			ch2=(*pStr++);
			continue;
		}
		s2.push_back(*pStr++);
	}
	int data1=atol(s1.c_str());
	int data2=atol(s2.c_str());
	if (ch1=='-'){
		data1=-data1;
	}
	if (ch2=='-'){
		data2=-data2;
	}
	if (op=='+'){
		cout<<data1-data2<<endl;
	}else{
		cout<<data1+data2<<endl;
	}
	return 0;
}