// your code goes here
function calc(m) {
var ret = 900;
if (m <= 1000) {
return ret;
}
var _m = m - 1000;
var _n1 = parseInt(_m / 500);
var _n2 = (_m % 500) == 0;
return ret + (300 * (_n1+ (_n2?0:1)) ) ;
}
print(calc(500));
print(calc(1000));
print(calc(1001));
print(calc(1200));
print(calc(1201));
print(calc(1601));
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