from bisect import bisect_left
import sys

int1 = lambda x: int(x) - 1

# input = lambda: sys.stdin.buffer.readline()
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
i1 = lambda: int1(input())
mi = lambda: map(int, input().split())
mi1 = lambda: map(int1, input().split())
li = lambda: list(mi())
li1 = lambda: list(mi1())
lli = lambda n: [li() for _ in range(n)]

INF = float("inf")
# mod = int(1e9 + 7)
mod = 998244353

N, I = mi()
s = [0] * N
a = [0] * N
for i in range(N):
    s[i], a[i] = mi()

dp = [-INF] * (I + 1)
dp[0] = 0
for i in range(N):
    for j in range(0, I + 1)[::-1]:
        if j + s[i] <= I:
            dp[j + s[i]] = max(dp[j + s[i]], dp[j] + a[i])
print(max(dp))