#include <assert.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct {
    int key;
    void* value;
} data;

typedef struct FibNode FibNode;

typedef struct FibNode FibNode;
struct FibNode {
    FibNode* left;
    FibNode* right;
    FibNode* parent;
    FibNode* child;
    int key;
    void* value;
    bool mark;
    int degree;
};

typedef FibNode FibHeap;
typedef FibNode FibElem;

FibNode* fib_node_init(int key, void* value) {
    FibNode* new_node = (FibNode *)malloc(sizeof(FibNode));
    new_node->left = new_node->right = new_node;
    new_node->key = key;
    new_node->value = value;
    new_node->parent = NULL;
    new_node->child = NULL;
    new_node->mark = false;
    new_node->degree = 0;
    return new_node;
}
void fib_node_free(FibNode* to_free) {
    to_free->degree = -1;
    free(to_free);
}
void fib_node_kill(FibNode* to_kill) {
    FibNode* kid = to_kill->child;
    if (kid) {
        kid->left->right = NULL;
        while (kid->right != NULL) {
            kid = kid->right;
            fib_node_kill(kid->left);
        }
        fib_node_kill(kid);
    }
    fib_node_free(to_kill);
}
void fib_node_add(FibNode* old, FibNode* new_right) {
    FibNode* oldRight = old->right;
    assert(old != new_right);
    assert(oldRight != new_right);
    old->right = new_right;
    oldRight->left = new_right;
    new_right->left = old;
    new_right->right = oldRight;
}
FibHeap* fib_heap_init(void) {
    return NULL;
}
FibElem* fib_heap_add(FibHeap** H, FibNode* new_node) {
    assert(H);
    assert(new_node);
    FibNode* old_node = *H;
    new_node->parent = NULL;
    new_node->mark = false;
    if (old_node) {
        fib_node_add(old_node, new_node);
        if (old_node->key > new_node->key)
            *H = new_node;
    }
    else {
        new_node->left = new_node;
        new_node->right = new_node;
        *H = new_node;
    }
    return new_node;
}
FibElem* fib_heap_insert(FibHeap** H, int key, void* value) {
    FibNode* new_node = fib_node_init(key, value);
    return fib_heap_add(H, new_node);
}
bool is_empty_fib_heap(FibHeap* H) {
    return H == NULL;
}
data fib_heap_min(FibHeap* H) {
    assert(H);
    data d;
    FibNode* head = H;
    d.key = head->key;
    d.value = head->value;
    return d;
}
data fib_heap_elem_data(FibElem* x) {
    assert(x);
    data d;
    d.key = x->key;
    d.value = x->value;
    return d;
}
void fib_heap_remove_from(FibHeap** H, FibNode* x) {
    assert(!x->parent);
    if (x->right == x)
        *H = NULL;
    else {
        x->left->right = x->right;
        x->right->left = x->left;
        *H = x->right;
    }
    x->left = x;
    x->right = x;
    x->parent = NULL;
}
FibHeap* fib_heap_union(FibHeap* H1, FibHeap* H2) {
    if (!H1)
        return H2;
    if (!H2)
        return H1;
    if (fib_heap_min(H2).key < fib_heap_min(H1).key)
        return fib_heap_union(H2, H1);
    FibNode* H1first = H1;
    FibNode* H1last = H1first->left;
    FibNode* H2first = H2;
    FibNode* H2last = H2first->left;
    H1last->right = H2first;
    H2first->left = H1last;
    H2last->right = H1first;
    H1first->left = H2last;
    return H1first;
}
FibNode* fib_heap_link(FibHeap** H, FibNode* x, FibNode* y) {
    assert(x);
    assert(y);
    assert(x->degree == y->degree);
    if (x->key > y->key)
        return fib_heap_link(H, y, x);
    fib_heap_remove_from(H, y);
    if (x->child) {
        FibNode* z = x->child;
        y->right = z;
        y->left = z->left;
        z->left->right = y;
        z->left = y;
    }
    y->parent = x;
    x->child = y;
    x->degree++;
    y->mark = false;
    return x;
}
void fib_heap_match_degrees(FibHeap** H, FibNode** A, FibNode* x) {
    int d = x->degree;
    while (A[d]) {
        if (d > 99)
            exit(1);
        FibNode* y = A[d];
        if (y != x) {
            x = fib_heap_link(H, x, y);
            A[d] = NULL;
            d++;
        }
        else
            break;
    }
    A[d] = x;
}
void fib_heap_consolidate(FibHeap** H) {
    FibNode* x = *H;
    if (!x)
        return;
    FibNode** A = (FibNode**)calloc(100, sizeof(FibNode));
    memset(A, '\0', 100);
    assert(x->degree >= 0);
    FibNode* last = x->left;
    while(x != last) {
        FibNode* next = x->right;
        fib_heap_match_degrees(H, A, x);
        x = next;
    }
    fib_heap_match_degrees(H, A, last);
    *H = fib_heap_init();
    for (int i=0; i<100; i++)
        if (A[i])
            fib_heap_add(H, A[i]);
    free(A);
}
data fib_heap_extract_min(FibHeap** H) {
    assert(H && *H);
    FibNode* z = *H;
    data d = fib_heap_elem_data(z);
    FibNode* first = z->child;
    fib_heap_remove_from(H, z);
    fib_node_free(z);
    if (first) {
        FibNode* current = first->right;
        while (current != first) {
            current->parent = NULL;
            current = current->right;
        }
        first->parent = NULL;
        *H = fib_heap_union(*H, first);
    }
    fib_heap_consolidate(H);
    return d;
}
void fib_heap_decrease_key(FibHeap** H, FibElem* x, int new_key) {
    assert(H && *H);
    assert(x && x->key >= new_key);
    x->key = new_key;
    if (x->parent && x->parent->key > new_key) {
        if (x->left == x) {
            assert(x->parent->degree == 2);
            x->parent->child = NULL;
        } else {
            assert(x->parent->degree > 2);
            x->left->right = x->right;
            x->right->left = x->left;
            x->parent->child = x->left;
        }
        x->parent->degree--;
        fib_heap_add(H, x);
        if (! x->parent->mark) {
            x->parent->mark = true;
        } else
            fib_heap_decrease_key(H, x->parent, x->parent->key);
    } else {
        if (new_key < (*H)->key) {
            assert(!x->parent);
            *H = x;
        }
    }
}
void fib_heap_delete(FibHeap** H, FibElem* x) {
    fib_heap_decrease_key(H, x, INT_MIN);
    fib_heap_extract_min(H);
}
void fib_heap_free(FibHeap** H) {
    FibNode* header = *H;
    FibNode* first = header;
    if (header) {
        while(header != first) {
            FibNode* next = header->right;
            fib_node_kill(header);
            header = next;
        }
    }
    *H = NULL;
}

int main(void) {
    int N;
    scanf(&N);
    int *A = (int *)malloc(N * sizeof(int));
    int *B = (int *)malloc((2 * N) * sizeof(int));
    if (A == NULL || B == NULL)
        return 1;
    FibHeap *pq_s = fib_heap_init();

    for (int i = 0; i < N; i++) {
        scanf("%d", &A[i]);
        fib_heap_insert(&pq_s, A[i], 0);
    }
    for (int i = 0; i < N; i++) {
        scanf("%d", &B[i]);
        B[i + N] = B[i];
    }
    int ans = 1073741823;
    for (int i = 0; i < N; i++) {
        FibHeap *pq;
        memcpy(pq, pq_s, sizeof(pq_s));
        int x = 0;
        for (int j = 0; j < N; j++) {
            data p = fib_heap_extract_min(&pq);
            p.value++;
            x = x > p.value ? x : p.value;
            p.key += B[i + j] / 2;
            fib_heap_insert(&pq, p.key, p.value);
        }
        ans = ans < x ? ans : x;
    }
    printf("%d\n", ans);
    fib_heap_free(&pq_s);
    free(A);
    free(B);
    return 0;
}