var David = 80 ; Vinoth =77; Divya =88 ; Ishitha =95; Thomas =50;
if(David < 60 || David < 70 || David < 80 || David < 90 || David<100)
{
    console.log("D Grade");
}
if(Vinoth < 60 || Vinoth < 70 || Vinoth < 80 || Vinoth < 90 || Vinoth<100)
{
    console.log("C Grade");
}
if(Divya < 60 || Divya < 70 || Divya < 80 || Divya < 90 || Divya<100)
{
    console.log("B Grade");
}
if(Ishitha < 60 || Ishitha < 70 || Ishitha < 80 || Ishitha < 90 || Ishitha<100)
{
    console.log("A Grade");
}
if(Thomas < 60 || Thomas < 70 || Thomas < 80 || Thomas < 90 || Thomas<100)
{
    console.log("F Grade");
}