#include <cstdio>

using namespace std;
int max(int x,int y)
{
    if(x>y) return x;
    else return y;
}
int dp[10001], p[5001], w[5001];
int n,g,i,j;

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    scanf("%d%d",&n,&g);
    for(i=1; i<=n; ++i) scanf("%d%d",&w[i],&p[i]);
    for(i=1; i<=n; ++i)
        for(j=g; j>=0; --j)
        {
            if(j >=w[i])
                dp[j]=max(dp[j],dp[j-w[i]]+p[i]);
            else
                dp[j]=dp[j];
        }
    printf("%d",dp[g]);

   return 0;
}