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#include <stdio.h>
using namespace std;
int n, g, d[10000+1];
int w[5000], p[5000];
int max(int a, int b)
{
if(a<=b) return b;
return a;
}
int main()
{
freopen("rucsac.in", "r", stdin);
freopen("rucsac.out", "w", stdout);
scanf("%d %d", &n, &g);
for(int i=0;i<n;i++)
{
scanf("%d%d", &w[i], &p[i]);
}
d[0]=0;
for(int i=1; i<=g; i++)
d[i]=-1;
for(int i=0; i<n; i++)
for(int greutate=g-w[i]; greutate>=0; greutate--)
{
if(d[greutate]!=-1)
{
d[greutate+w[i]]=max(d[greutate+w[i]],d[greutate]+p[i]);
}
}
int maxi=0;
for(int i=0; i<=g; i++)
{
if(d[i]>maxi)maxi=d[i];
}
printf("%d ", maxi);
return 0;
}