#include <iostream>

using namespace std;

int main()
{
    int n;
    bool ell=false;
    bool ell2=false;
    cin>>n;
    int s[n];
    int s2[n];
    for (int i=0;i<n;i++){
        cin>>s[i];
        s2[i]=s[i];
    }

    bool end=false;
    int m=0;
    if(s[0]==0){
        m++;
    }
    int ans=0;
    while(end==false){

        for(int i=m;i<n-1;i++){
            if(s[i]+s[i+1]==1){
                s[i]=0;
                s[i+1]=0;
                if(m==1){
                    s[i]=1;
                    s[i+1]=1;
                }
                ans++;
            }

        }
        for(int l=n-1;l>-1;l--){
            if(s[l]!=1){
                ell=true;
            }
            if(ell==true && s[l]==1){
                end=false;
                break;
            }
            end=true;
        }
    }
    cout<<ans<<endl;
bool end2=false;
    int m2=0;
    if(s2[0]==0){
        m2++;
    }
    int ans2=0;
    while(end2==false){
        for(int i=m2;i<n-3;i++){
            if(s2[i]+s2[i+1]+s2[i+2]+s2[i+3]==2){
                s2[i]=0;
                s2[i+1]=0;
                s2[i+2]=0;
                s2[i+3]=0;
                if(m2=1){
                    s2[i]=1;
                    s2[i+1]=1;
                    s2[i+2]=1;
                    s2[i+3]=1;
                }
                ans2++;
            }
        }
        for(int i=m2;i<n-1;i++){
            if(s2[i]+s[i+1]==1){
                s2[i]=0;
                s2[i+1]=0;
                if(m2==1){
                    s2[i]=1;
                    s2[i+1]=1;
                }
                ans2++;
            }

        }
        for(int l=n-1;l>-1;l--){
            if(s2[l]!=1){
                ell2=true;
            }
            if(ell2==true && s2[l]==1){
                end2=false;
                break;
            }
            end2=true;
        }
    }
    cout<<ans2<<endl;



    return 0;
}