'use strict';
(function(stdin) {
    var inputs = stdin.toString().split(' ').map(Number);
    var a = inputs[0];
    var b = inputs[1];
    var c = inputs[2];
    var count = 0;
    for (var i = a; i <= b; i++) {
        if (c % i === 0)
            count++;
    }
    console.log(count);

}(require('fs').readFileSync('/dev/stdin', 'utf8')));