#include <iostream>

#define MOD 1000000007
#define N_MAX 300002

using namespace std;

typedef long long ll;
typedef pair<ll, ll> P;

ll inv[N_MAX],fac[N_MAX],finv[N_MAX];
ll pow[N_MAX];

void init(){
    fac[0]=fac[1]=1;
    finv[0]=finv[1]=1;
    inv[1]=1;
    pow[0] = 1;
    pow[1] = 2;
    for(int i=2;i<N_MAX;i++){
        inv[i]=MOD-inv[MOD%i]*(MOD/i)%MOD;
        fac[i]=fac[i-1]*(ll) i%MOD;
        finv[i]=finv[i-1]*inv[i]%MOD;
        pow[i] = pow[i-1]*2;
        pow[i] %= MOD;
    }
}

ll inv_(ll n){
    if(n == 1) return 1;
    else return MOD-inv_(MOD%n)*(MOD/n)%MOD;
}

ll comb(ll n, ll r){
  ll ans;
  if(n < r){
      ans = 0;
  }else{
      ans = (fac[n]*finv[r])%MOD;
      ans = (ans*finv[n-r])%MOD;
      ans = (ans+MOD)%MOD;
  }
  return ans;
}

int main(){
    init();
    ll a, b, c;
    cin >> a >> b >> c;
    ll N = a+b+c;
    ll ans = 0;
    for(int i = 1; i <= a; i++){
        ll tmp = (comb(N-i-1, a-i)*comb(N-a-1, b-1))%MOD;
        tmp *= (pow[N-i-1]-1);
        tmp %= MOD;
        tmp *= c;
        tmp %= MOD;
        tmp *= inv[N-i-1];
        tmp %= MOD;
        ans += tmp;
        //cout << tmp << endl;
        ans %= MOD;
    }
    cout << ans << endl;
}