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#include <fstream>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
#define MAXN 5005
int w[MAXN],p[MAXN];
int i,j,n,g,crt,dp[MAXN];
int main()
{
cin>>n>>g;
for(i=1; i<=n; i++)
cin>>w[i]>>p[i];
for(i=1; i<=n; i++)
{
crt+=w[i]; // adun greutatea
if(crt>g)
crt=g;
for(j=crt; j>=w[i]; j--)
dp[j]=max(dp[j],dp[j-w[i]]+p[i]);
}
cout<<dp[g];
}