#include<cstdio>
int N,G,a[10005],i,j,w,p;
int main()
{
	freopen("rucsac.in", "r", stdin);
	freopen("rucsac.out", "w", stdout);
    scanf("%d%d", &N, &G); a[0]=1;
    for(i=1;i<=N;i++)
    {
        scanf("%d%d", &w, &p);
        for (j=G-w;j>=0;j--)
        {
            if (a[j]+p>a[j+w])
                a[j+w]=a[j]+p;
        }
    }
    for(i=0;i<=G;i++)
    {
        if(a[i]>p)
            p=a[i];
    }
    printf("%d", p-1);
    return 0;
}