N, I = map(int, input().split())
dp = [[-10**18]*(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)
    
print(dp[-1][I])