Worldbuilders Probability

function compute(tickets) {
    var Prob,nn,m,n,x;
    nn=Math.floor(0); // because this is 0 ...
    m=Math.floor(2054);
    n=Math.floor(tickets);
    x=Math.floor(0);
    if ((n<=0)||(m<=0)||(nn<=0)) {
        alert("Parameters must be positive integers");
        Prob=0 // ... this is set to 0 ...
    } else if ((m>nn)||(n>nn)) {
        alert("m and n must be less than N");
        Prob=0
    } else if ((x<0)||(x<n+m-nn)) {Prob=0} else if ((x>=n)||(x>=m)) {Prob=1} else {
        if (2*m>nn) {
            if (2*n>nn) {Prob=hyp(nn-m-n+x,nn-n,nn-m,nn)} else {Prob=1-hyp(n-x-1,n,nn-m,nn)}
        } else if (2*n>nn) {Prob=1-hyp(m-x-1,m,nn-n,nn)} else {Prob=hyp(x,n,m,nn)}
    }
    Prob=Math.round(Prob*100000)/100000; // ... which means this is 0 ...

    return {
        probability: Prob,
        percentage: (1 - Prob) * 100 // ... so this always works out to 100%
    }
}