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#include <fstream>
#include <algorithm>
using namespace std;
int n,wmax,nmax;
int i,cap;
int p[5010],w[5010];
int dp[5010][10010];
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int main()
{
cin>>n>>wmax;
for(i=1;i<=n;i++)
{
cin>>w[i]>>p[i];
}
for(i=1;i<=n;i++)
{
for(cap=0;cap<=wmax;cap++)
{
//dp[0][cap]=0;
//if(cap-w[i]<0)
dp[i][cap]=dp[i-1][cap];
if(cap-w[i]>=0)
{
dp[i][cap]=max(dp[i-1][cap],dp[i-1][cap-w[i]]+p[i]);
nmax=dp[i][cap];
}
}
}
nmax=dp[n][wmax];
cout<<nmax;
return 0;
}