N,I = map(int,input().split())
dp = [[-1<<60] * (I+1) for _ in range(N+1)]
dp[0][0] = 0

for i in range(N):
	s,a = map(int,input().split())
	for j in range(I+1):
		dp[i+1][j] = max(dp[i+1][j],dp[i][j])
		if j + s <= I:
			dp[i+1][j+s] = max(dp[i+1][j+s],dp[i][j] + a)

ans = 0
for j in range(I+1):
	ans = max(ans, dp[N][j])
print(ans)