#include <stdio.h>
// test_your_gdb
// flag{te5t_y0ur_9db}

void reverse(char *buf) {
    for(int i = 0; i < 4; ++i) {
        char tmp = buf[i];
        buf[i] = buf[7-i];
        buf[7-i] = tmp;
    }
}

int main() {
    char buf[0x20];
    long long x = 0x666c61677b746535;
    long long y = 0x745f793075725f39;
    long long z = 0x64627d;
    *(long long *) buf = x;
    *(long long *) (buf+8) = y;
    *(long long *) (buf+16) = z;
    reverse(buf);
    reverse(buf+8);
    char tmp = buf[16];
    buf[16] = buf[18];
    buf[18] = tmp;
    return x + y + z;
}