var calcul3DTab = function(a) {

	var b=[];
		
	if (a.length==3){
		return a[2](a[0],a[1]);
	}
	
	else {
		var i=0;
		do {
			b[i]=a[i];
			i++;
		}
		while ((typeof a[i])!="function");
		
		b[i-2]= a[i](a[i-2],a[i-1]);
		
		i--;
		
		while (i<a.length-2) {
			b[i]= a[i+2];
			i++;
		}
		
		return calcul3DTab(b);				
	}
		
};

var calcul3D = function() {
	return calcul3DTab(arguments);
};