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#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int dp[5][100], w[5050],p[5050], n,g,ok,i;
int main()
{
fin>>n>>g;
for( i=1;i<=n;++i)
fin>>w[i]>>p[i];
for( i=1, ok=1;i<=n;++i, ok=1-ok)
for(int j=0;j<=g;++j)
{
if(j>=w[i])
dp[ok][j]=max(dp[1-ok][j], dp[1-ok][j-w[i]]+p[i]);
else dp[ok][j]=dp[1-ok][j];
}
fout<<dp[1-ok][g];
return 0;
}