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: Accepted)

#include <stdio.h>

int main()
{
    int a,b,c,d,e,k;
    int ab,ac,ad,ae,bc,bd,be,cd,ce,de;

    scanf("%d\n",&a);
    scanf("%d\n",&b);
    scanf("%d\n",&c);
    scanf("%d\n",&d);
    scanf("%d\n",&e);
    scanf("%d\n",&k);

    ab=b-a;
    ac=c-a;
    ad=d-a;
    ae=e-a;
    bc=c-b;
    bd=d-b;
    be=e-b;
    cd=d-c;
    ce=e-c;
    de=e-d;

    if(ab<=k && ac<=k && ad<=k && ae<=k && bc<=k && bd<=k && be<=k && cd<=k && ce<=k && de<=k){
        printf("Yay!\n");
    }
    else{
        printf(":(\n");
    }    

    return 0;
}