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#include <bits/stdc++.h>
#define N 5005
#define G 10005
#define INF 0x3f3f3f3f
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n,g,w[N],p[N],dp[N][G];
void citire()
{
in>>n>>g;
for(int i=1;i<=n;i++)
{
in>>w[i]>>p[i];
}
}
void dinamica()
{
for(int j=1;j<=g;j++)
if(w[1]<=j)
dp[1][j]=p[1];
for(int i=2;i<=n;i++)
{
for(int j=1;j<=g;j++)
{
dp[i][j]=max(dp[i-1][j],dp[i-1][j-w[i]]+p[i]);
}
}
out<<dp[n][g];
}
int main()
{
citire();
dinamica();
return 0;
}