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'use strict';

const fs = require('fs');

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', inputStdin => {
    inputString += inputStdin;
});

process.stdin.on('end', _ => {
    inputString = inputString.replace(/\s*$/, '')
        .split('\n')
        .map(str => str.replace(/\s*$/, ''));

    main();
});

function readLine() {
    return inputString[currentLine++];
}

// Complete the beautifulDays function below.
function beautifulDays(i, j, k) {
    var sum = 0;
    for (var p = i; p <= j; p++) {
        var r = (p + "").split('').reduce((reversed, character) => character + reversed, '');
        // console.log(p,r,k, Math.abs(p - parseInt(r)));
        if (Math.abs(p - parseInt(r)) % k ===0)
            sum++;
    }
    return sum;
}

function main() {
    const ws = fs.createWriteStream(process.env.OUTPUT_PATH);

    const ijk = readLine().split(' ');

    const i = parseInt(ijk[0], 10);

    const j = parseInt(ijk[1], 10);

    const k = parseInt(ijk[2], 10);

    let result = beautifulDays(i, j, k);

    ws.write(result + "\n");

    ws.end();
}
