#include <bits/stdc++.h>

using namespace std;
int n,m,i,s,dp[10001],cst[10001],val,x,j;
int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++)
    {
        scanf("%d%d",&x,&val);
        for(j=m;j>=x;j--)
          dp[j]=max(dp[j-x]+val,dp[j]);
    }
    printf("%d",dp[m]);
    return 0;
}