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#include<bits/stdc++.h>
#define maxn 5005
#define maxG 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gmax,G[maxn],P[maxn];
int dp[2][maxG];
void citire()
{
fin>>n>>gmax;
for(int i=1;i<=n;i++)
fin>>G[i]>>P[i];
}
void dinamica()
{
dp[1%2][G[1]]=P[1];
for(int i=2;i<=n;i++)
{
for(int j=1;j<=gmax;j++)
{
if(j>=G[i])
dp[i%2][j]=max(dp[(i-1)%2][j],dp[(i-1)%2][j-G[i]]+P[i]);
else
dp[i%2][j]=max(dp[i%2][j],dp[(i-1)%2][j]);
}
}
fout<<dp[n%2][gmax];
}
int main()
{
citire();
dinamica();
return 0;
}