#include <fstream>
#include <cstring>
using namespace std;
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int dp[10001],n,i,j,g,G,p;
int main()
{
    cin>>n>>G;
    memset(dp,-1,sizeof(dp));
    dp[0]=0;
    for(i=1;i<=n;i++)
    {
        cin>>g>>p;
        for(j=G-g;j>=0;j--)///j greutate obt anterior
            if(dp[j]!=-1&&dp[j+g]<p+dp[j])
                dp[j+g]=dp[j]+p;
    }
    ///det max din dp;
    int Max=-1;
    for(i=1;i<=G;i++)
        Max=max(Max,dp[i]);
    cout<<Max;
    return 0;
}