import io
import sys

sys.stdin = io.StringIO('''5 2 3
3 1 6 2 5''')  # 4

n, l, r = map(int, input().split())
a = list(map(int, input().split()))
s = 0
for i in range(n - 1):
    for j in range(i + 1, n):
        if l <= abs(a[i] - a[j]) <= r:
            s += 1

print(s)