#include<stdio.h>
#include<string.h>
char *s,sir[2000005];
long int L,sol,i,lung[2000005],st,dr,maxa,maxg,l1,l2,l3;
int main()
{
	FILE *f,*g;f=fopen("pscpld.in","r");g=fopen("pscpld.out","w");
	sir[0]='#';
	s=&sir[1];fscanf(f,"%s",s);
	L=strlen(s);
	for(i=L-1;i>=0;i--){ s[2*i+2]=' ';s[2*i+1]=s[i];}
	s[0]=' ';
	maxg=2;
	L=2*L;s[L+1]='*';
	for(i=1;i<L;i++)
	{
	  while(s[i+lung[i]+1]==s[i-lung[i]-1])lung[i]++;
	  maxa=i+lung[i];
	  if(maxa>maxg)
	  { for(dr=maxg+1;dr<=maxa;dr++)
	    { st=2*i-dr;
	      l1=lung[st];l2=lung[dr];l3=st+lung[i]-i;
	      l1=(l1<l3)?l1:l3;
	      lung[dr]=(l1>l2)?l1:l2;
	    }
	    maxg=maxa;
	  }
	  sol=sol+(lung[i]+i%2)/2;
	}
	fprintf(g,"%ld\n",sol);
	return 0;
}