#include <iostream>
#include <algorithm>
using namespace std;
using i64 = long long;

class range {private: struct I{int x;int operator*(){return x;}bool operator!=(I& lhs){return x<lhs.x;}void operator++(){++x;}};I i,n;
public:range(int n):i({0}),n({n}){}range(int i,int n):i({i}),n({n}){}I& begin(){return i;}I& end(){return n;}};

int main(void) {
  string s; cin >> s;
  int n = s.size();
  int a = 0, b = 0;
  int sa = 1, sb = 1;
  char op = '?';
  for(int i : range(n)) {
    if(s[i] == '-' || s[i] == '+') {
      if(i == 0) {
        if(s[i] == '-') { sa = -1; }
      } else if(op != '?') {
        if(s[i] == '-') { sb = -1; }
      } else {
        op = s[i];
      }
    } else {
      if(op == '?') {
        a = a * 10 + int(s[i]-'0');
      } else {
        b = b * 10 + int(s[i]-'0');
      }
    }
  }
  a *= sa, b *= sb;
  int res = a + (op=='-' ? b : -b);
  printf("%d\n", res);
  return 0;
}