import sys
def input():
 	return sys.stdin.readline()[:-1]

MOD = 10**9 + 7
n, m, k = map(int, input().split())
ele = []
for _ in range(m):
	l, r = map(int, input().split())
	ele.append([l-1, r-1])

dp = [[0 for _ in range(n+1)] for _ in range(k+1)]
dp[0][0] = 1

for i in range(k):
	tmp = [0]
	for j in range(n):
		tmp.append(tmp[-1] + dp[i][j])
	#print(tmp)
	def get(l, r):
		return tmp[r+1] - tmp[l]
	for j in range(m):
		l, r = ele[j][0], ele[j][1]
		dp[i+1][l] += get(l, r)
		dp[i+1][r+1] -= get(l, r)

	for j in range(1, n+1):
		dp[i+1][j] += dp[i+1][j-1]
		dp[i+1][j] %= MOD

	dp[i+1][0] %= MOD

#print(dp)
print(dp[k][n-1])