#include <stdio.h> 
int main() {
    char op;
    double num1, num2, result;
    if (scanf(" %c %lf %lf", &op, &num1 ,&num2) !=3) {
        printf("Invalid input\n");
    } return 0;
    switch (op) {
        case'+': result=num1+num2; printf("%g\n", result); break;
        case'-': result=num1-num2; printf("%g\n", result); break;
        case'*': result=num1*num2; printf("%g\n", result); break;
        case'/': if (num2 == 0) { printf("Invalid input\n");
    } else {
        result = num1 / num2;
        printf("%g\n", result); break;
        default: printf("Invalid input\n");
    } return 0;