#include <cstdio>

#define NMAX 5005
#define GMAX 10005

int n,g;
int w[NMAX],p[NMAX];
int dp[2][GMAX];


inline int max(const int a,const int b)
{
    return (a>b?a:b);
}

void read()
{
    scanf("%d%d",&n,&g);
    for(int i=1;i<=n;++i)
        scanf("%d%d",&w[i],&p[i]);
}

void solve()
{
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=g;++j)
        {
            dp[1-i%2][j]=dp[i%2][j];
            if(j>=w[i])
                dp[1-i%2][j]=max(dp[i%2][j],dp[i%2][j-w[i]]+p[i]);
            //printf("%d ",dp[1-i%2][j]);
        }
        //printf("\n");
    }
    printf("%d\n",dp[1-n%2][g]);
}

int main()
{
    freopen("rucsac.in","r",stdin);
    freopen("rucsac.out","w",stdout);
    read();
    solve();
    return 0;
}