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#include <cstdio>
#include <algorithm>
using namespace std;
int n, g, i, j, w[5001], p[10001], d1[10001], d2[10001];
int main()
{
freopen ("rucsac.in", "r", stdin);
freopen ("rucsac.out", "w", stdout);
scanf ("%d%d", &n, &g);
for (i=1; i<=n; i++) scanf ("%d%d", &w[i], &p[i]);
for (i=1; i<=n; i++)
{
for (j=1; j<=g; j++)
{
d2[j]=d1[j];
if (w[i]<=j) d2[j]=max(d2[j], d1[j-w[i]]+p[i]);
}
for (j=1; j<=g; j++) d1[j]=d2[j];
}
printf ("%d", d2[g]);
}