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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int a[5001],n,m,s[100001],c[5001],i,j;
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>a[i]>>c[i];
}
for(i=1;i<=n;i++)
{
for(j=m;j>=0;j--)
{
if(j-a[i]==0)
{
if(c[i]>s[j])
{
s[j]=c[i];
}
}
else
{
if(j-a[i]>0 && s[j-a[i]]!=0 && s[j-a[i]]+c[i]>s[j])
{
s[j]=s[j-a[i]]+c[i];
}
}
}
}
g<<s[m];
return 0;
}