#include <iostream>
using namespace std;
int count = 0;
int selet (int a){
    while(a>=2){
        if(a%2==0)
        {    count++;
            a=a/2;
        }
        else break;
}
    while(a>=3){
        if(a%3==0)
        {
            count++;
            a=a/3;
        }
        else break;
    }
        return count;

void main(){
    int n;
    cout<<"输入一个整数"<<endl;
    cin>>n;
    selet (n);
    int s;
    s=2*count+2;
    cout<<s;
    }
E:\C++\zhengshu.cpp(22) : error C2601: 'main' : local function definitions are illegal
E:\C++\zhengshu.cpp(31) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

zhengshu.obj - 2 error(s), 0 warning(s)
编译出错；哪位高手帮帮忙呀