```\nfunction getMultiplier(address account) private view returns (uint256) {\n    uint256 multiplier;\n    if (_multiplier[account] && block.timestamp > _holderFirstBuyTimestamp[account] + 1 weeks && \n        block.timestamp < _holderFirstBuyTimestamp[account] + 2 weeks) {\n        multiplier = balanceOf(account).mul(3);\n    }\n    else if (_multiplier[account] && block.timestamp > _holderFirstBuyTimestamp[account] + 2 weeks && \n             block.timestamp < _holderFirstBuyTimestamp[account] + 3 weeks) {\n                 multiplier = balanceOf(account).mul(5);\n    }\n    else if (_multiplier[account] && block.timestamp > _holderFirstBuyTimestamp[account] + 3 weeks) {\n                 multiplier = balanceOf(account).mul(7);\n    }\n    else {\n        multiplier = balanceOf(account);\n    }\n    \n    return\n            multiplier;\n}\n```\n