import java.util.*;
 
class Main {
 
  public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  }
 
} import java.util.*; util.* java class Main {
 
  public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  }
 
} Main public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  } main {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int[] fromAnt; fromAnt fromAnt = new int[5] fromAnt new int[5] 5 int[] toAnt; toAnt toAnt = new int[5] toAnt new int[5] 5 for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    } {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    } fromAnt[i] = sc.nextInt() fromAnt[i] fromAnt i sc.nextInt() sc.nextInt sc toAnt[i] = fromAnt[i] toAnt[i] toAnt i fromAnt[i] fromAnt i int k = sc.nextInt(); k sc.nextInt() sc.nextInt sc for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    } int i = 0; int i = 0; i 0 i < 5 i 5 i++ i++ i {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    } {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    } for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      } int j = i+1; int j = i+1; j i+1 i 1 j < 5 j 5 j++ j++ j {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      } {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      } if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        } toAnt[j] - fromAnt[i] > k toAnt[j] - fromAnt[i] toAnt[j] toAnt j fromAnt[i] fromAnt i k {
          System.out.println(":(");
          return;
        } System.out.println(":(") System.out.println System.out System System.out ":(" return; System.out.println("Yay!") System.out.println System.out System System.out "Yay!" return; String[] args args
import java.util.*;
 
class Main {
 
  public static void main(String[] args) {
    
    Scanner sc = new Scanner(System.in);
    
    int[] fromAnt;
    fromAnt = new int[5];
    int[] toAnt;
    toAnt = new int[5];
    
    for(int i = 0; i < 5; i++) {
      fromAnt[i] = sc.nextInt();
      toAnt[i] = fromAnt[i];
    }
    int k = sc.nextInt();
    
    for(int i = 0; i < 5; i++) {
      for(int j = i+1; j < 5; j++) {
        if(toAnt[j] - fromAnt[i] > k) {
          System.out.println(":(");
          return;
        }
      }
    }
    
    System.out.println("Yay!");
	return;    
  }
 
}
