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#include <cstdio>
using namespace std;
struct rucsac{long long p,g;};
rucsac v[5005];
long long m[5005];
long long maxim(long long x,long long y)
{
if(x>y)
return x;
else
return y;
}
int main()
{
freopen("rucsac.in","r",stdin);
freopen("rucsac.out","w",stdout);
int n,gmax,i,j;
long long maxi=0;
scanf("%d%d",&n,&gmax);
for(i=1;i<=n;i++)
scanf("%lld%lld",&v[i].g,&v[i].p);
for(i=1;i<=n;i++)
for(j=gmax;j>=v[i].g;j--)
m[j]=maxim(m[j],m[j-v[i].g]+v[i].p);
for(i=0;i<=gmax;i++)
maxi=maxim(maxi,m[i]);
printf("%lld",maxi);
return 0;
}