Mineral Water ver2

let smallBottles = +gets();
let bigBottles = +gets();
let capacity = +gets();
if(bigBottles >= (parseInt(capacity/5))){
    if(smallBottles>=(capacity%5)){
        print(capacity%5)
    } else {
        print('-1')
    }
} else if (bigBottles<(parseInt(capacity/5))){
    if(smallBottles>=capacity-(bigBottles*5)){
        print(capacity-bigBottles*5)
    } else {
        print('-1')
    }
}