#include <cstdio>
#include <algorithm>
using namespace std;
const int NMAX = 5e3, GMAX = 1e4;
int main() {
    int N, G;
    int W[NMAX + 5], P[NMAX + 5];
    int D[2][GMAX + 5];
    freopen("rucsac.in", "r", stdin);
    freopen("rucsac.out", "w", stdout);
    scanf("%d%d", &N, &G);
    for(int i = 1; i <= N; ++i)
        scanf("%d%d", &W[i], &P[i]);
    int l = 0;
    for(int i = 1; i <= N; ++i, l = 1 - l)
        for(int 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]);
        }
    printf("%d\n", D[l][G]);
    return 0x0;
}