# Original solution


import os
import sys
from io import BytesIO, IOBase

if sys.version_info[0] < 3:
    from builtins import xrange as range
    from future_builtins import ascii, filter, hex, map, oct, zip


def knapsack(W,n):
  if n==0 or W==0 :
    return 0
  elif cache.get((W,n)):
    return cache[(W,n)]
  
  else:
    if wt[n-1]<=W:
      cache[(W,n)]=max(knapsack(W,n-1),p[n-1]+knapsack(W-wt[n-1],n-1))
      return cache[(W,n)]
    else:
      cache[(W,n)]=knapsack(W,n-1)
      return cache[(W,n)]
    
wt,p=[],[]
cache={}
def main():
    n,w=map(int,input().split())
    
    for _ in range(n):
      temp_wt,temp_pr=map(int,input().split())
      wt.append(temp_wt)
      p.append(temp_pr)
    print(knapsack(w,n))

# region fastio

BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


def print(*args, **kwargs):
    """Prints the values to a stream, or to sys.stdout by default."""
    sep, file = kwargs.pop("sep", " "), kwargs.pop("file", sys.stdout)
    at_start = True
    for x in args:
        if not at_start:
            file.write(sep)
        file.write(str(x))
        at_start = False
    file.write(kwargs.pop("end", "\n"))
    if kwargs.pop("flush", False):
        file.flush()


if sys.version_info[0] < 3:
    sys.stdin, sys.stdout = FastIO(sys.stdin), FastIO(sys.stdout)
else:
    sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)

input = lambda: sys.stdin.readline().rstrip("\r\n")

# endregion

if __name__ == "__main__":
    main()

# Optimized solution
# what is dp relation 
# dp[n][w]=max(dp[n-1][w-wt[n]]+p[n],dp[n-1][w])

n,W=list(map(int,input().split()))
wt,p=[],[]
for _ in range(n):
    a,b=list(map(int,input().split()))
    wt.append(a)
    p.append(b)
dp=[[0 for i in range(W+1)]for j in range(n+1)]
for x in range(1,n+1):
    for y in range(1,W+1):
        if wt[x-1]<=y:
            dp[x][y]=max(dp[x-1][y-wt[x-1]]+p[x-1],dp[x-1][y])
        else:
            dp[x][y]=dp[x-1][y]
print((dp[-1][-1]))