//Problem TaskName

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<algorithm>
#include<cmath>
#include<vector>
#include<set>
#include<queue>

using namespace std;

int get()
{
  char c;
  while(c=getchar(),(c<'0'||c>'9')&&(c!='-'));
  bool flag=(c=='-');
  if(flag)
    c=getchar();
  int x=0;
  while(c>='0'&&c<='9')
    {
      x=x*10+c-48;
      c=getchar();
    }
  return flag?-x:x;
}

void output(int x)
{
  if(x<0)
    {
      putchar('-');
      x=-x;
    }
  int len=0,data[10];
  while(x)
    {
      data[len++]=x%10;
      x/=10;
    }
  if(!len)
    data[len++]=0;
  while(len--)
    putchar(data[len]+48);
  putchar('\n');
}

const int mod=1000000007;

long long Pow(long long a,long long b)
{
  if(!b)
    return 1;
  long long t=Pow(a*a%mod,b/2);
  if(b&1)
    t=t*a%mod;
  return t;
}

int main()
{
  long long a,b,t;
  cin>>a>>b>>t;
  cout<<Pow((a+b)/2,t)<<endl;
  return 0;
}