function main(input) {
  var temp = input.split(' ').map(Number);
  var a = temp[0];
  var b = temp[1];
  var c = temp[2];
  var count = 0;
  for (var i = a; i <= b; i++) {
    if (c%i == 0) {
      count++
    }
  }
  console.log(count);
}

var x = require('fs').readFileSync('/dev/stdin', 'utf-8');
main(x);
