// Infoarena - Arhiva Educationala rucsac
// Februrie 2012 Marius Dumitran
// Programare dinamica clasica timp O(N*G) memorie O(G)
 
#include<string.h>
#include<stdio.h>
#include<vector>
#include<algorithm>
#define maxn 5001
#define maxg 10001
 
using namespace std;
 
int W[maxn], P[maxn];
int Optim[maxg];
 
int main() {
     
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    int N, G;
    scanf("%d %d", &N, &G);
     
    for (int i = 1; i <= N; ++i) {
        scanf("%d %d", &W[i], &P[i]);
    }
     
    Optim[0] = 0;
    int sol = 0;
     
    for( int i = 1; i <= N; ++i)
        for( int j = G - W[i]; j >= 0; --j) {
            if( Optim[j+W[i]] < Optim[j] + P[i] )
            {
                Optim[j+W[i]] = Optim[j] + P[i];
                if( Optim[j+W[i]] > sol)
                    sol = Optim[j+W[i]];
            }
        }
    printf("%d", sol);
    return 0;
}