N, I = map(int, input().split())
s = [0]*N
a = [0]*N

for i in range(N):
    si, ai = map(int, input().split())
    s[i] = si
    a[i] = ai

dp = [[0]*(I+1) for i in range(N+1)]

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

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

print(res)