function exam(input) {
    let days = +input.shift()
    let food = +input.shift()
    let sumDog = 0
    let sumCat = 0
    let biscuits = 0

    for (let i = 1; i <= days; i++) {
        let dog = +input.shift()
        let cat = +input.shift()

        if (i % 3 == 0) {
            biscuits = (dog + cat) * 0.10
        }

        sumDog += dog
        sumCat += cat
    }
    let sumAll = sumDog + sumCat
    let sumPercent = (sumAll / food) * 100
    let sumDogPercent = (sumDog / sumAll) * 100
    let sumCatPercent = (sumCat / sumAll) * 100
    console.log(`Total eaten biscuits: ${Math.round(biscuits)}gr.`)
    console.log(`${sumPercent.toFixed(2)}% of the food has been eaten.`)
    console.log(`${sumDogPercent.toFixed(2)}% eaten from the dog.`)
    console.log(`${sumCatPercent.toFixed(2)}% eaten from the cat.`)
}