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#include<bits/stdc++.h>
using namespace std;
int n,m;
const int maxN=5000;
const int maxG=10005;
pair<int,int> v[maxN];
long long dp[maxG];
int g;
int main()
{
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",&v[i].first,&v[i].second);
for(int i=1;i<=g;i++)
dp[i]=-1LL;
dp[0]=0;
for(int i=1;i<=n;i++)
{
for(int j=g-v[i].first;j>=0;j--)
if(dp[j]!=-1LL) dp[j+v[i].first]=max(dp[j+v[i].first],dp[j]+1LL*v[i].second);
}
long long sol=0;
for(int i=0;i<=g;i++)
sol=max(sol,dp[i]);
printf("%lld\n",sol);
return 0;
}