This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
int n;
int a[50010];
int b[5];
int ball;
int main()
{
scanf("%d",&n);
for(int i=1;i<=n;i++){
scanf("%d",&a[i]);
}
for(int i=1;i<=n;i++){
if(a[i]==1)
{
ball++;
if(ball==4)
{
ball=0;
b[0]++;
for(int j=3;j>=0;j--){
if(j==0||b[j]==1&&b[j-1]==1)
{
b[j+1]++;
b[j]--;
}
}
}
}
if(a[i]==2)
{
ball=0;
b[0]++;
for(int j=3;j>=0;j--){
if(j==0||b[j]>=1&&b[j-1]==1)
{
b[j+1]++;
b[j]--;
}
}
}
if(a[i]==3)
{
ball++;
if(ball==4)
{
ball=0;
b[0]++;
for(int j=3;j>=0;j--){
if(j==0||b[j]==1&&b[j-1]==1)
{
b[j+1]++;
b[j]--;
}
}
}
else{
for(int j=3;j>=0;j--){
if(b[j]>=1)
{
b[j+1]++;
b[j]--;
}
}
}
}
}
printf("%d",b[4]);
}
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