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#include <cstdio>
using namespace std;
int n,gmax,g[5001],c[5001],cmax[10002],util[10005][5005];
int maxx;
int main()
{
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
scanf("%d%d",&n,&gmax);
for(int i=1;i<=n;i++)
scanf("%d%d",&g[i],&c[i]);
for(int i=1;i<=gmax;i++)
cmax[i]=-1;
for(int i=1;i<=n;i++)
for(int j=gmax-g[i];j>=0;j--)
if(cmax[j]!=-1)
if(cmax[j]+c[i]>cmax[j+g[i]])
{cmax[j+g[i]]=c[i]+cmax[j];
for(int k=1;k<=n;k++)
util[j+g[i]][k]=util[j][k];
util[j+g[i]][i]=1;
}
int k;
for(int i=1;i<=gmax;i++)
if(cmax[i]>maxx) {maxx=cmax[i];k=i;}
printf("%d\n",maxx);
// for(int i=1;i<=n;i++)
// if(util[k][i])printf("%d ",i);
return 0;
}