var lines = [];
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});
reader.on('line', function (line) {
  var i,cnt=0;
  var a = line.split(' ');
  var c = parseInt(a[0],10);
  var d = parseInt(a[1],10);
  var e = parseInt(a[2],10);
  for(i=c;i<=d;i++){
    if(e%i==0)
      cnt = cnt + 1;
  }
  console.log(cnt);
  process.exit();
});
process.stdin.on('end', function () {
});