#include<iostream>
#include<string>
using namespace std;
int main(){
	string s;
	int num = 0;
	int a[2] = {0};
	int j = 0;
	int oporate = 1;
	int temp;
	int size = 0;
	int ans = 0;
	cin>>s;
	 size = s.size();
	 for(int i=0;i<size;i++){
	 	if(s[i]>='0'&&s[i]<='9'){
	 		temp = s[i]-'0';
	 		num=num*10+temp;
	 	}
	 else if(s[i]=='+') oporate = 1,a[j] = num,num = 0,j++;
	 else if(s[i]=='-')  oporate = 2,a[j] = num,num = 0,j++;
	 else if(s[i]=='*') oporate = 3,a[j] = num,num = 0,j++;
	 else if(s[i]=='/') oporate =4,a[j] = num,num = 0,j++; 
	 }

	 switch(oporate){
	 	case 1: ans = a[0]+num;break;
	 	case 2: ans = a[0]-num;break;
	 	case 3: ans = a[0]*num;break;
	 	case 4: ans = a[0]/num;break;
	 	defualt:break; 
	 }
	 cout<<ans;
	return 0;
}