/*#include<stdio.h>
int main()
{
int n, i, b, result=0;
int x[10000]={}, t[10000]={};
scanf("%d", &n);
for(i=0; i<n; i++){
scanf("%d", &x[i]);
if(i==n-1){
b=x[i];
}
}
for(i=0; i<n; i++){
scanf("%d", &t[i]);
}
result=b-1;
int c=n-1;
for(i=b; i>=0; i--)
{
result++;
if(x[c]==i){
if(t[c]>result){
result+=t[c]-result;
}
c--;
}
}
printf("%d", result);
}
*/
//31963, 두 배
#include<stdio.h>
int main()
{
int n, i, cnt=0, b=0;
int a[250001]={};
scanf("%d", &n);
scanf("%d", &a[0]);
for(i=1; i<n; i++){
scanf("%d", &a[i]);
while(a[i]<a[i-1]){
a[i]*=8;
cnt+=3;
b=1;
}
while(a[i]/2>=a[i-1]&&b==1){
a[i]/=2;
cnt--;
}
b=0;
}
printf("%d", cnt);
}
//비율로 시도? a[i-1]/a[i]