func_code_string: #include <bits/stdc++.h>   using namespace std;   const int Inf = (int)1e9 + 7;   const long long LongInf = (long long)1e18 + 7;   namespace {   const int N = 1007;   const int MOD = (int)1e9 + 7;   int k, pa, pb;   long long dp[N][N];   long long pw(long long x, int m) {     if (m == 0) return 1;     long long y = pw(x, m / 2);     y = (y * y) % MOD;     if (m % 2) y = (y * x) % MOD;     return y;   }   long long inv(int x) { return pw(x, MOD - 2); }   void solve() {     cin >> k >> pa >> pb;     long long s = inv(pa + pb);     pa = (pa * s) % MOD;     pb = (pb * s) % MOD;     long long res = 0;     dp[1][0] = 1;     long long rem = (pa * inv(pb)) % MOD;     for (int i = 1; i <= k; i++) {       for (int j = 0; j <= k; j++) {         if (i + j >= k) {           res += (dp[i][j] * (i + j + rem)) % MOD;           res %= MOD;         } else {           (dp[i + 1][j] += (dp[i][j] * pa) % MOD) %= MOD;           (dp[i][i + j] += (dp[i][j] * pb) % MOD) %= MOD;         }       }     }     cout << res <<   n ;   }   }  // namespace   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     cout.precision(9);     cout << fixed;     solve();     return 0;   }   