如何在多维json字符串中查找最大值

Question

如何在这个json字符串中找到最大值（125）？

    {"cols": [{"label": "Month", "type":"string"},{"label": "Count", "type":"number"}],"rows": [{"c":[{"v": "dec -11"}, {"v": 53}]},{"c":[{"v": "nov -11"}, {"v": 95}]},{"c":[{"v": "oct -11"}, {"v": 125}]},{"c":[{"v": "sep -11"}, {"v": 100}]}]}