#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

// 假设的 Fibonacci 函数实现
unsigned long int fib(unsigned long int n) {
    if (n <= 1) return n;
    return fib(n - 1) + fib(n - 2);
}

int main() {
    char buffer[1024];  // Buffer to store input data

    // Read data from stdin into buffer
    ssize_t bytes_read = read(0, buffer, sizeof(buffer) - 1);
    if (bytes_read < 0) {
        perror("Error reading input");
        return 1;
    }
    buffer[bytes_read] = '\0'; 

    unsigned long int num1, num2;

    char *line = strtok(buffer, "&");
    char *second_part = strtok(NULL, "&"); // Assume the rest of the string is the second number

    if (line && sscanf(line, "%lu", &num1) == 1 && 
        second_part && sscanf(second_part, "%lu", &num2) == 1) {
        // Calculate Fibonacci numbers and their sum
        unsigned long int fib1 = fib(num1);
        unsigned long int fib2 = fib(num2);
        unsigned long int sum = fib1 + fib2;

        // Prepare output string
        char output[1024];
        int len = snprintf(output, sizeof(output), "Fibonacci(%lu) + Fibonacci(%lu) = %lu + %lu = %lu\n", num1, num2, fib1, fib2, sum);

        // Write to stdout
        write(1, output, len);
    } else {
        const char *error_msg = "Invalid input. Please enter two numbers separated by .\n";
        write(1, error_msg, strlen(error_msg));
        return 1;
    }

    return 0;
}