AmCharts.makeChart("chartdiv",
    {
        "type": "serial",
        "categoryField": "Month",
        "startDuration": 1,
        "theme": "black",
        "categoryAxis": {
            "gridPosition": "start"
        },
        "trendLines": [],
        "graphs": [
            {
                "balloonText": "[[title]] of [[Month]]:[[value]]",
                "bullet": "round",
                "id": "AmGraph-1",
                "title": "graph 1",
                "valueField": "Solved"
            }
        ],
        "guides": [],
        "valueAxes": [
            {
                "id": "ValueAxis-1",
                "title": "Solves"
            }
        ],
        "allLabels": [],
        "balloon": {},
        "legend": {
            "enabled": true,
            "useGraphSettings": true
        },
        "titles": [
            {
                "id": "Title-1",
                "size": 15,
                "text": "No. of Challenges Solved"
            }
        ],
        "dataProvider": [
            {
                "Month": "Jan",
                "Solved": 8
            },
            {
                "Month": "Feb",
                "Solved": 6
            },
            {
                "Month": "Mar",
                "Solved": 2
            },
            {
                "Month": "Apr",
                "Solved": 1
            },
            {
                "Month": "May",
                "Solved": 2
            },
            {
                "Month": "Jun",
                "Solved": 3
            },
            {
                "Month": "Jul",
                "Solved": 6
            },
            {
                "Month": "Aug",
                "Solved": 2
            },
            {
                "Month": "Sep",
                "Solved": 3
            },
            {
                "Month": "Oct",
                "Solved": 4
            },
            {
                "Month": "Nov",
                "Solved": null
            },
            {
                "Month": "Dec",
                "Solved": null
            }
        ]
    }
);