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<cstdio>
int main()
{
int i,n,r=0;
int w,x,y,z;
scanf("%d",&n);
w=x=y=z=0;
while(n--)
{
scanf("%d",&i);
if(i==1)
{
w++;
if(w==4)
{
w=0;
x++;
if(x>1)
{
y++;
x--;
}
if(y>1)
{
z++;
y--;
}
if(z>1)
{
r++;
z--;
}
}
}
if(i==2)
{
w=0;
x++;
if(x>1)
{
y++;
x--;
}
if(y>1)
{
z++;
y--;
}
if(z>1)
{
r++;
z--;
}
}
if(i==3)
{
w++;
r+=z;
z=y;
y=x;
x=0;
if(w==4)
{
w=0;
x++;
if(x>1)
{
y++;
x--;
}
if(y>1)
{
z++;
y--;
}
if(z>1)
{
r++;
z--;
}
}
}
}
printf("%d",r);
}
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