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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
long long w[5010],p[5010],k,n,m,i,j,dp[3][10010],s=0,maxi=0,g;
int main()
{
fin>>n>>g;
for(i=1;i<=n;i++)
{
fin>>w[i]>>p[i];
}
for(i=1;i<=n;i++)
for(j=1;j<=g;j++)
{
dp[i%2][j]=dp[1-i%2][j];
if(j>=w[i])
dp[i%2][j]=max(dp[i%2][j],dp[1-i%2][j-w[i]]+p[i]);
}
for(j=1;j<=g;j++)
maxi=max(dp[n%2][j],maxi);
fout<<maxi;
return 0;
}