Problem:
﻿Score: 100 points

Problem Statement

In AtCoder city, there are five antennas standing in a straight line. They are called Antenna A, B, C, D and E from west to east, and their coordinates are a, b, c, d and e, respectively.

Two antennas can communicate directly if the distance between them is k or less, and they cannot if the distance is greater than k.

Determine if there exists a pair of antennas that cannot communicate directly.

Here, assume that the distance between two antennas at coordinates p and q (p < q) is q - p.

Constraints

a, b, c, d, e and k are integers between 0 and 123 (inclusive).

a < b < c < d < e

Input

Input is given from Standard Input in the following format:

a
b
c
d
e
k

Output

Print :( if there exists a pair of antennas that cannot communicate directly, and print Yay! if there is no such pair.

Sample Input 1

1
2
4
8
9
15

Sample Output 1

Yay!

In this case, there is no pair of antennas that cannot communicate directly, because:

the distance between A and B is 2 - 1 = 1

the distance between A and C is 4 - 1 = 3

the distance between A and D is 8 - 1 = 7

the distance between A and E is 9 - 1 = 8

the distance between B and C is 4 - 2 = 2

the distance between B and D is 8 - 2 = 6

the distance between B and E is 9 - 2 = 7

the distance between C and D is 8 - 4 = 4

the distance between C and E is 9 - 4 = 5

the distance between D and E is 9 - 8 = 1

and none of them is greater than 15. Thus, the correct output is Yay!.

Sample Input 2

15
18
26
35
36
18

Sample Output 2

:(

In this case, the distance between antennas A and D is 35 - 15 = 20 and exceeds 18, so they cannot communicate directly.
Thus, the correct output is :(.

Solution in C (GCC 5.4.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>

int8_t main(void) {
    uint8_t buffer[4], pos_values[5], max_distance;
    for (uint8_t i = 0; i < 5; i++) {
        if (fgets(buffer, 4, stdin) != NULL) {
            pos_values[i] = atoi(buffer);
        } else {
            fprintf(stderr, "[x] fgets() error.\n");
            return 1;
        }
    }
    if (fgets(buffer, 4, stdin) != NULL) {
        max_distance = atoi(buffer);
    } else {
        fprintf(stderr, "[x] fgets() error.\n");
        return 1;
    }
    uint8_t flag = 1;
    for (uint8_t i = 0; i < 5; i++) {
        for (uint8_t j = i+1; j < 5; j++) {
            if (pos_values[j]-pos_values[i] > max_distance) {
                flag = 0;
                break;
            }
        }
        if (!flag) {
            break;
        }
    }
    if (flag) {
        printf("Yay!");
    } else {
        printf(":(");
    }
}