// Need bignumber as we are dealing with VLNs
var BigNumber = require('bignumber.js');

function processData(input) {
  let args = input.split(' '), 
      a = new BigNumber(args[0]),
      b = new BigNumber(args[1]),
      time = new BigNumber(args[2]);
  
  let base = a.add(b).mul('0.5');
  let mod = new BigNumber(Math.pow(10,9) + 7);
    
  let colony = power(base, time, mod);
  
  console.log(colony.toString());
} 

function power(base, exp, mod) {
  let resp = new BigNumber('1');
  base = base.mod(mod);
  while (exp.gt('0')) {
    if (!exp.mod('2').eq('0')) {
      resp = resp.mul(base).mod(mod);
    }
    exp = exp.divToInt('2');
    base = base.mul(base).mod(mod);
  }
  return resp;
}

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   processData(_input);
});