#include<stdio.h>
#include<algorithm>
#include<cstring>
#define maxn 5005
#define maxg 10005
using namespace std;

int n,g;
int w[maxn],p[maxn];
int s[maxg];

void read()
{
    scanf("%d%d",&n,&g);
    for(int i=1;i<=n;i++) scanf("%d%d",&w[i],&p[i]);
}

void solve()
{
    int i,j;

    for(i=1;i<=n;i++)
     for(j=g;j>=0;j--)
        if(j-w[i]>=0 && s[j-w[i]]+p[i]>s[j]) s[j]=s[j-w[i]]+p[i];
}

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

    read();
    solve();
    printf("%d",s[g]);

    fclose(stdin);
    fclose(stdout);
    return 0;
}