'use strict';
process.stdin.on('data', function(chunk) {
 
  var inputs = chunk.toString().trim();
  var data = inputs.split(' ').map(Number);
  var a = data[0];
  var b = data[1];
  var c = data[2];
  var count = 0;
   
  for (var i = a; i < b + 1; i++) {
    if (c % i === 0) {
      count++;
    }
  }
  console.log(count);
 
 
});
process.stdin.resume();
process.stdin.setEncoding('utf8')