function calcMaxDeposit() public view returns (uint) {

        if (totalInvested <= 50 ether) {
            return 1.5 ether;
        } else if (totalInvested <= 150 ether) {
            return 3 ether;
        } else if (totalInvested <= 300 ether) {
            return 5 ether;
        } else if (totalInvested <= 500 ether) {
            return 7 ether;
        } else {
            return 10 ether;
        }

    }