var toInt = x=>parseInt(x,10);
var toIntArr = arr=>arr.map(x=>toInt(x));
var abs = x=>x>0?x:-x;
function min(){var rest=arguments,v=rest[0];for(var i=1;i<rest.length;i++)if(rest[i]<v)v=rest[i];return v}
function max(){var rest=arguments,v=rest[0];for(var i=1;i<rest.length;i++)if(rest[i]>v)v=rest[i];return v}
function gcd(){var rest=arguments,v=rest[0],temp=(a,b)=>b?temp(b,a%b):a;for(var i=1;i<rest.length;i++)v=temp(v,rest[i]);return v}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
 
function Main(input){
	var input = input.split('\n');
	var n = toInt(input[0]);
	var vs = toIntArr(input[1].split(' '));
	var odd = [];
	var even = [];
	for(var i = 0; i < n; i++){
		if(i%2===1){
			even[vs[i]] = !even[vs[i]]? 1: even[vs[i]] + 1; 
		}else{
			odd[vs[i]] = !odd[vs[i]]? 1: odd[vs[i]] + 1; 
		}
	}
	var xs = odd.map((e,ind,arr)=>({el:e,ind:ind})).filter(el=>el.el>0).sort((a,b)=>b.el-a.el);
	var ys = even.map((e,ind,arr)=>({el:e,ind:ind})).filter(el=>el.el>0).sort((a,b)=>b.el-a.el);
	var ans = 0;
	if(xs[0].ind === ys[0].ind){
		if(xs.length === 1){
			if(ys.length === 1){
				ans = n/2;
			}else{
				ans = n/2 - ys[1].el;
			}
		}else{
			if(ys.length === 1){
				ans = n/2 - xs[1].el;
			}else{
				ans = min(n - xs[0].el - ys[1].el, n - xs[1].el - ys[0].el);
			}
		}
	}else{
		ans = n - xs[0].el - ys[0].el;
	}

	console.log(ans);
	return 0;
}

