rocess.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data',function(chunk){

var inputs = chunk.toString().trim();
var line = inputs.split(' ').map(Number);
var a = line[0];
var b = line[1];
var c = line[2];
var count = 0;

for(var i = a; i < b ; i++){

if(c % i ===0){
    count++;
  }
 }
console.log(count);
});