'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');