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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 fairRations function below.

function fairRations(B) {

let count = 0;

let i = 0;

while (i < B.length) {

if (B[i] % 2 !== 0 && (i + 1) < B.length) {

B[i] = B[i] + 1;

B[i + 1] = B[i + 1] + 1;

count += 2;

}

i++;

}

i = 0;

while (i < B.length) {

if (B[i] % 2 !== 0){

return "NO";

}

i++;

}

return count;

}

function main() {

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

const N = parseInt(readLine(), 10);

const B = readLine().split(' ').map(BTemp => parseInt(BTemp, 10));

let result = fairRations(B);

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

ws.end();

}