#include <cstdio>
#include <algorithm>

using namespace std;

int n, g;
int mat[5005];
int profit[5005];

void citire()
{
    scanf("%d %d", &n, &g);

    int tmp1, tmp2;

    for(int i = 1; i <= n; i++)
    {
        scanf("%d %d", &tmp1, &tmp2);

        for(int j = g; j >= tmp1; j--)
        {
            mat[j] = max(mat[j], tmp2 + mat[j - tmp1]);
        }
    }

    printf("%d", mat[g]);
}

int main()
{
    freopen("rucsac.in", "r", stdin);
    freopen("ruscac.out", "w", stdout);

    citire();


    return 0;
}