#include <iostream>
using namespace std;

template <typename T> T read() {
  T res = 0, f = 1;
  char ch = getchar();
  for (; !isdigit(ch); ch = getchar()) if (ch == '-') f = -1;
  for (; isdigit(ch); ch = getchar()) res = (res << 3) + (res << 1) + (ch ^ 48);
  return res * f;
}

void read(char *str) {
  char ch = getchar();
  for (; isspace(ch); ch = getchar());
  for (; !isspace(ch); ch = getchar()) *str++ = ch;
  *str = 0;
}

template <typename T> void write(T x, char ed = '\n') {
  int sta[sizeof(T) << 2], top = 0;
  do {
    sta[++top] = x % 10;
    x /= 10;
  } while(x);
  while (top) {
    putchar(sta[top--] ^ 48);
  }
  putchar(ed);
}

const int MAXN = 1510;

int n, q;
char a[MAXN][MAXN];
int c[MAXN][MAXN];

int callback(int x, int y) {
  int res = 0;
  if (a[x - 1][y] == 'D') res = res + 1 + callback(x - 1, y);
  if (a[x][y - 1] == 'R') res = res + 1 + callback(x, y - 1);
  return res;
}

int calcsum() {
  int res = 0;
  for (int i = 1; i <= n; ++i) {
    res += c[i][n + 1] * callback(i, n + 1);
    res += c[n + 1][i] * callback(n + 1, i);
  }
  return res;
}

void change(int x, int y) {
  a[x][y] = a[x][y] == 'D' ? 'R' : 'D';
}

int main() {
  freopen("zunxun.in", "r", stdin);
  freopen("zunxun.out", "w", stdout);
  n = read<int>();
  for (int i = 1; i <= n; ++i) {
    read(a[i] + 1);
    c[i][n + 1] = read<int>();
  }
  for (int i = 1; i <= n; ++i) {
    c[n + 1][i] = read<int>();
  }

  write(calcsum());
  cin >> q;
  for (int a, b; q--; ) {
    a = read<int>(), b = read<int>();
    change(a, b);
   write(calcsum());
  }
  return 0;
}