UnsignedInt

class UnsignedInt{
    private long value;
    private static final long MODULO = (long)Math.pow(2, 32);

    public UnsignedInt(String value){
        this.value = Long.valueOf(value);
        toUnsigned();
    }

    public UnsignedInt(long value) {
        this.value = value;
        toUnsigned();
    }

    private void toUnsigned(){
        if (value < 0)
            value = value % MODULO == 0 ? 0 : value + (-value / MODULO + 1) * MODULO;
        else
            value = value % MODULO;
    }

    private long getValue(){
        return this.value;
    }

    public void add(UnsignedInt value) {
        this.value = (this.value + value.getValue()) % MODULO;
    }

    public void subtract(UnsignedInt value) {
        this.value = (this.value - value.getValue() + MODULO) % MODULO;
    }

    @Override
    public String toString() {
        return String.valueOf(value);
    }

    public void multiply(UnsignedInt value) {
        this.value = this.value * value.getValue();
        toUnsigned();
    }

    public void divide(UnsignedInt value) {
        this.value = this.value / value.getValue();
        toUnsigned();
    }

    public void modulo(UnsignedInt value) {
        this.value = this.value % value.getValue();
        toUnsigned();
    }
}