func_code_string: #include <bits/stdc++.h>   using namespace std;   template <typename T, typename TT>   ostream& operator<<(ostream& s, pair<T, TT> t) {     return s <<  (  << t.first <<  ,  << t.second <<  ) ;   }   template <typename T>   ostream& operator<<(ostream& s, vector<T> t) {     for (int(i) = 0; (i) < (sz(t)); ++(i)) s << t[i] <<    ;     return s;   }   int r, n;   long long MOD = 1000003;   long long qp(long long a, long long b) {     long long x = 1;     while (b) {       if (b & 1) x = x * a % MOD;       a = a * a % MOD;       b >>= 1;     }     return x;   }   int main() {     cin >> r >> n;     long long ans = 0, cur = 1;     for (int a = n, b = 1; b <= r; a++, b++) {       cur = cur * a % MOD * qp(b, MOD - 2) % MOD;       ans = (ans + cur) % MOD;     }     cout << ans <<   n ;   }   