// GPT TESTING
#include <bits/stdc++.h>
using namespace std;
const int N = 205;
int n, m, a[N], b[N], f[N][N];
int main() {
cin >> n >> m;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++) cin >> b[i];
memset(f, 0x3f, sizeof f);
f[0][0] = 0;
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= n; j++) {
if (f[i][j] >= m) continue;
if (i + 1 <= n) f[i + 1][j] = min(f[i + 1][j], f[i][j] + (a[i + 1] + b[i + 1]));
if (j + 1 <= n) f[i][j + 1] = min(f[i][j + 1], f[i][j] + (a[j + 1] + b[j + 1]));
if (i + 1 <= n && j + 1 <= n) f[i + 1][j + 1] = min(f[i + 1][j + 1], f[i][j] + abs(a[i + 1] - a[j + 1]) + abs(b[i + 1] - b[j + 1]));
}
}
int ans = 0;
for (int i = 0; i <= n; i++) {
for (int j = 0; j <= n; j++) {
if (f[i][j] >= m) continue;
ans = max(ans, i + j);
}
}
cout << ans << endl;
return 0;
}
