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#include <iostream>
using namespace std;
const int N=1010;
int v[N],w[N],f[N];
int n,m;
int main()
{
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i++) scanf("%d%d",&v[i],&w[i]);
for(int i=1;i<=n;i++)
for(int j=m;j>=v[i];j--)
{
f[j]=max(f[j],f[j-v[i]]+w[i]);
}
printf("%d",f[m]);
return 0;
}