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

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

  double num1, num2;
  char op;
  if (scanf(" %lf %c %lf = ", &num1, &op, &num2) != 3) {
    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 = floor(num1 / num2);
    break;
  };

  if (result > INT_MAX) {
    printf("%.1e\n", result);
  } else {
    printf("%ld\n", (long)result);
  }
}