function reverse(n) {
    return Number(('' + n).split('').reverse().join(''));
}

function getBeautifulDayCount(i,j,k) {
    var count = 0;
    for (var num=i; num <= j; num++) {
        var diff = Math.abs(reverse(num) - num);
        if (diff % k === 0) {
            count++;
        }
    }
    return count;
}

function processData(input) {
    var arr = input.split(' ').map(Number);
    var i = arr[0];
    var j = arr[1];
    var k = arr[2];
    
    console.log(getBeautifulDayCount(i,j,k));
}