#include <fstream>
#include <string>
#include <sstream>
#include <stack>

inline char prec(char c){ switch(c){
	case '+': case '-': return 1;
	case '*': case '/': return 2;
	default: return 0;
} }

std::stack<int> num;

inline void calc(char c){
	int a=num.top(); num.pop();
	int b=num.top(); num.pop();

	switch(c){
		case '+': num.push(a+b); break;
		case '-': num.push(b-a); break;
		case '*': num.push(a*b); break;
		case '/': num.push(b/a); break;
	}
}


int main(){
	std::ifstream fin("evaluare.in");
	std::ofstream fout("evaluare.out");

	std::string s; fin>>s;

	std::istringstream in(s);

	std::stack<char> op;

	char c;
	bool next_neg=false;
	bool prev_nr_rp=false; //previous was number or right parantheses so we don't treat - as unary

	while(in.get(c)){
		if(c>='0'&&c<='9'){
			in.putback(c);
			int value; in>>value;

			num.push(next_neg?-value:value);
			prev_nr_rp=true;
			next_neg=false;

		}
		else if(c=='+' || c=='-' || c=='*' || c=='/'){
			if(c=='-'&&(!prev_nr_rp)) next_neg=true;
			else if(c!='+'||prev_nr_rp){
				while( !op.empty() && op.top()!='(' && prec(c)<=prec(op.top()) ){
					calc(op.top());
					op.pop();
				}
				op.push(c);
			}
			prev_nr_rp=false;
		}
		else if(c=='('){
			op.push('(');
			prev_nr_rp=false;
		}
		else if(c==')'){
			while(op.top()!='('){ calc(op.top()); op.pop();	}
			op.pop();
			prev_nr_rp=true;
		}
	}

	while(!op.empty()){ calc(op.top()); op.pop(); }

	fout<<num.top()<<'\n';
}