#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
  printf("Zadejte vzorec:\n");

  double num1, num2;
  char op;
  char equal_sign;
  if (scanf("%lf %c %lf %c", &num1, &op, &num2, &equal_sign) != 4 || equal_sign != '=') {
    printf("Nespravny vstup.\n");
    return EXIT_FAILURE;
  }

  if (op != '+' && op != '-' && op != '*' && op != '/') {
    printf("Nespravny vstup.\n");
    return EXIT_FAILURE;
  }

  if (op == '/' && num2 == 0) {
    printf("Nespravny vstup.\n");
    return EXIT_FAILURE;
  }

  double result = 0;
  switch (op) {
  case '+':
    result = num1 + num2;
    break;
  case '-':
    result = num1 - num2;
    break;
  case '*':
    result = num1 * num2;
    break;
  case '/':
    result = num1 / num2;
    if (result < 0) {
      result = ceil(num1 / num2);
    } else {
      result = floor(num1 / num2);
    }
    break;
  }

  if (fabs(result - (int)result) < 1e-9) {
    printf("%ld\n", (long)result);
  } else {
    printf("%.12g\n", result);
  }
}