#include <stdio.h>
#define MAXN 5010
#define MAXG 10010
int max(int a,int b){
    if(a>b)
        return a;
    return b;
}
int N, G, Pmax,cw,i;
int W[MAXN], P[MAXN];
int D[2][MAXG];

int main()
{
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    scanf("%d%d", &N, &G);
    for(i = 1; i <= N; ++i)
        scanf("%d%d", &W[i], &P[i]);
    int l=0;
    for( i = 1; i <= N; ++i, l = 1 - l)
        for( cw = 0; cw <= G; ++cw){
            D[1-l][cw] = D[l][cw];
             if(W[i] <= cw)
                D[1-l][cw] = max(D[1-l][cw], D[l][cw - W[i]] + P[i]);
        }
    Pmax = D[l][G];
     printf("%d\n", Pmax);
    return 0;
}