#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll N=1e3+100;
ll n,m;
ll v[N],w[N];
ll f[N];
int main()
{
cin>>n>>m;
for(ll i=1;i<=n;i++)cin>>v[i]>>w[i];
for(ll i=1;i<=n;i++)
for(ll j=m;j>=v[i];j--)
f[j]=max(f[j],f[j-v[i]]+w[i]);
cout<<f[m];
return 0;
}