function stocks(input) {
    let city = input[0];
    let sales = Number(input[1]);
    let earns = 0

    if (city == "Sofia") {
        if (sales >= 0 && sales <= 500) {
            earns = sales * 0.05;
        } else if (sales > 500 && sales <= 1000) {
            earns = sales * 0.07;
        } else if (sales > 1000 && sales <= 10000) {
            earns = sales * 0.08;
        } else if (sales > 10000) {
            earns = sales * 0.12;
        }
    } else if (city == "Varna") {
        if (sales >= 0 && sales <= 500) {
            earns = sales * 0.045;
        } else if (sales > 500 && sales <= 1000) {
            earns = sales * 0.075;
        } else if (sales > 1000 && sales <= 10000) {
            earns = sales * 0.1;
        } else if (sales > 10000) {
            earns = sales * 0.13;
        }
    } else if (city == "Plovdiv") {
        if (sales >= 0 && sales <= 500) {
            earns = sales * 0.055;
        } else if (sales > 500 && sales <= 1000) {
            earns = sales * 0.08;
        } else if (sales > 1000 && sales <= 10000) {
            earns = sales * 0.12;
        } else if (sales > 10000) {
            earns = sales * 0.145;
        }
    }

    /* if (earns <= 0 && city != (city == "Sofia" || city == "Varna" || city == "Plovdiv")) {
         console.log('error');
     } else {
         console.log((earns).toFixed(2));
     }*/
    if ((city != "Sofia" || city != "Varna" || city != "Plovdiv") && earns <= 0) {
        console.log("error");
    } else {
        console.log((earns).toFixed(2));
    }
}