function P(f,m,e){
 this.female = f;
 this.male = m;
 this.eis = e;
}
P.prototype.fWeight = 22;
P.prototype.mWeight = 269;
P.prototype.sexCombined = sexCom;

function sexCom(){
 var wSum = this.fWeight * this.female + this.mWeight * this.male;
 var sumOfWs = this.fWeight + this.mWeight;
 return  Math.round(wSum/sumOfWs);
}