void printf(char*, ...);

int fibonacci(int n) {
    if (n < 2)
        return 1;
    return fibonacci(n - 1) + fibonacci(n - 2);
}

void change_first(char otus[5]) {
    otus[0] = 115;
}

int main() {
    char text[29] = "10th fibonacci number is %d!";
    printf(text, fibonacci(10));

    char somelist[5];

    somelist[0] = 15;
    change_first(somelist);

    return somelist[0];
}