#include #include #include using namespace std;

int main() { string line; getline(cin, line);

// 找到运算符位置
int opPos = -1;
char op;
for (int i = 0; i < line.length(); i++) {
    if (line[i] == '+' || line[i] == '-' || line[i] == '*' || line[i] == '/' || line[i] == '%') {
        opPos = i;
        op = line[i];
        break;
    }
}

// 提取左边运算数
string leftStr = line.substr(0, opPos);
// 提取右边运算数
string rightStr = line.substr(opPos + 1);

// 去除前后空格
leftStr.erase(0, leftStr.find_first_not_of(" "));
leftStr.erase(leftStr.find_last_not_of(" ") + 1);
rightStr.erase(0, rightStr.find_first_not_of(" "));
rightStr.erase(rightStr.find_last_not_of(" ") + 1);

int a = stoi(leftStr);
int b = stoi(rightStr);

int result;
switch (op) {
    case '+': result = a + b; break;
    case '-': result = a - b; break;
    case '*': result = a * b; break;
    case '/': result = a / b; break;
    case '%': result = a % b; break;
    default: break;
}

cout << result << endl;

return 0;

}