#include <bits/stdc++.h>
#define maxn 5001
#define maxg 10001

using namespace std;

int n, sol, i, j, g, W[maxn], P[maxn], v[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]);
    v[0] = 0;
    for(i=1; i<=n; i++)
        for(j=g - W[i]; j>=0; j--)
        {
            if( v[j+W[i]] < v[j] + P[i] )
            {
                v[j+W[i]] = v[j] + P[i];
                if( v[j+W[i]] > sol)
                    sol = v[j+W[i]];
            }
        }
    printf("%d", sol);
    return 0;
}