#include <bits/stdc++.h>
long long k, pa, pb, dp[1107][1107];
int main() {
  scanf("%lld%lld%lld", &k, &pa, &pb);
  long long invb = 1, base = pb;
  for (int t = 1000000007 - 2; t; t >>= 1, (base *= base) %= 1000000007)
    if (t & 1) (invb *= base) %= 1000000007;
  long long inva_b = 1;
  base = pa + pb;
  for (int t = 1000000007 - 2; t; t >>= 1, (base *= base) %= 1000000007)
    if (t & 1) (inva_b *= base) %= 1000000007;
  long long invab = pa * invb % 1000000007;
  pa *= inva_b;
  pa %= 1000000007;
  pb *= inva_b;
  pb %= 1000000007;
  for (int i = k; ~i; --i)
    for (int j = k; ~j; --j)
      if (i + j >= k)
        dp[i][j] = (i + j + invab) % 1000000007;
      else
        dp[i][j] =
            pa * dp[i + 1][j] % 1000000007 + pb * dp[i][i + j] % 1000000007,
        dp[i][j] %= 1000000007;
  printf("%lld\n", dp[1][0]);
  return 0;
}
