import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  }
} import java.io.BufferedReader; BufferedReader java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.IOException; IOException java.io public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  }
} Main public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  } main {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  } BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); in new BufferedReader(new InputStreamReader(System.in)) int[] a = new int[5]; a new int[5] 5 for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    } int i=0; int i=0; i 0 i<5 i 5 i++ i++ i {
      a[i] = Integer.parseInt(in.readLine());
    } {
      a[i] = Integer.parseInt(in.readLine());
    } a[i] = Integer.parseInt(in.readLine()) a[i] a i Integer.parseInt(in.readLine()) Integer.parseInt Integer in.readLine() in.readLine in int k = Integer.parseInt(in.readLine()); k Integer.parseInt(in.readLine()) Integer.parseInt Integer in.readLine() in.readLine in boolean flg = true; flg true for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    } int i=0; int i=0; i 0 i<5 i 5 i++ i++ i {
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    } {
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    } for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      } int j=i+1; int j=i+1; j i+1 i 1 j<5 j 5 j++ j++ j {
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      } {
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      } if(a[j]-a[i]>k) {
          flg = false;
          break;
        } a[j]-a[i]>k a[j]-a[i] a[j] a j a[i] a i k {
          flg = false;
          break;
        } flg = false flg false break; System.out.println(flg==true?"Yay!":":(") System.out.println System.out System System.out flg==true?"Yay!":":(" flg==true flg true "Yay!" ":(" String[] args args public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  }
} public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  }
} Main
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main {
  public static void main(String[] args) throws IOException {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    int[] a = new int[5];
    for(int i=0; i<5; i++){
      a[i] = Integer.parseInt(in.readLine());
    }
    int k = Integer.parseInt(in.readLine());
    boolean flg = true;

    for(int i=0; i<5; i++){
      for(int j=i+1; j<5; j++){
        if(a[j]-a[i]>k) {
          flg = false;
          break;
        }
      }
    }
    System.out.println(flg==true?"Yay!":":(");
  }
}