#include <cctype>
#include <cstring>
#include <iostream>

int main() {
    char s[100];
    char oper = 0;
    int res1 = 0, res2 = 0, a = 0;
    std::cin.getline(s, sizeof(s));
    int len = strlen(s);
    for (int i = 0; i < len; i++) {
        while (isdigit(s[i]) && i < len) {
            res1 = 10 * res1 + s[i] - '0';
            i++;
        }
        while (s[i] == ' ' && i < len) i++;
        oper = s[i++];
        while (s[i] == ' ' && i < len) i++;
        while (isdigit(s[i]) && i < len) {
            res2 = 10 * res2 + s[i] - '0';
            i++;
        }
    }
    switch (oper) {
    case '+':
        a = res1 + res2;
        break;
    case '-':
        a = res1 - res2;
        break;
    case '*':
        a = res1 * res2;
        break;
    case '/':
        if (res2) a = res1 / res2;
        else std::cout << "\nError\n";
        break;
    case '%':
        if (res2) a = res1 % res2;
        else std::cout << "\nError\n";
        break;
    default:
        std::cout << "\nError\n";
        break;
    }
    std::cout << a << '\n';
    return 0;
}