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#include <iostream>
#include <algorithm>
using namespace std;
int dp[2][10002],i,j,n,G;
int i1=0,i2=1;
int p[10002],g[10002];
int main()
{
cin>>n>>G;
for(i=1;i<=n;i++)
{
cin>>g[i]>>p[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=G;j++)
{
if(g[i]>j)
{
dp[i2][j]=dp[i1][j];
}
else
{
dp[i2][j]=max(dp[i1][j],dp[i1][j-g[i]]+p[i]);
}
}
i1=1-i1;
i2=1-i2;
}
cout<<dp[0][G];
return 0;
}