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#include <iostream>
#include <math.h>

using namespace std;
int Suma_cif (unsigned long x)
{

    int S= 0;
    while(x){
        S+=x%10;
        x/=10;}
return S;}
int Cif_control (unsigned long x)
{
    while(x>9)
        x=Suma_cif(x);
return x;
}
int Prim(int x)
{
    if (x<2)
        return 0;
    for(int i=2;    i<= sqrt(x);i++)
        if(x%i == 0)
            return 0;
    return 1;
}
int Nr_Cifre_pare(long N)
{
    int nr=0,uc;
    while(N!=0){
        uc=N%10;
        if(uc%2==0)
            nr++;
        N/=10;

    }
return nr;
}
int Triunghi(float a, float b,float c)
{

    if((a+b)>c) & ((a+c)>b) & ((b+c)>a)
        return 1;
    else
        return 0;
int main()
}
int Palindrom(int n)
{
    int inv=0,cn=n;
    while(n!=0)
        inv =inv*10 + n%10;
    n/=10;

}




{

/*    int N,p,x;#include <iostream>
#include <math.h>

using namespace std;
int Suma_cif (unsigned long x)
{

    int S= 0;
    while(x){
        S+=x%10;
        x/=10;}
return S;}
int Cif_control (unsigned long x)
{
    while(x>9)
        x=Suma_cif(x);
return x;
}
int Prim(int x)
{
    if (x<2)
        return 0;
    for(int i=2;    i<= sqrt(x);i++)
        if(x%i == 0)
            return 0;
    return 1;
}
int Nr_Cifre_pare(long N)
{
    int nr=0,uc;
    while(N!=0){
        uc=N%10;
        if(uc%2==0)
            nr++;
        N/=10;

    }
return nr;
}
int main()

{
/*    int N,p,x;
    cin >>N;
    cout <<endl <<"Cerinta A: ";
    for (int i=2;i<=N;i++)
        if(Prim(i) ==1)
            cout << i << " ";
    cout <<endl <<"Cerinta B: ";
int gasite=0,i=2;
while(gasite < N){
    if (Prim(i))
        gasite++;
        i++;
    cout << i << " ";
}

int N;
cin >> N;
cout << Nr_Cifre_pare(N);


return 0;
}

    cin >>N;
    cout <<endl <<"Cerinta A: ";
    for (int i=2;i<=N;i++)
        if(Prim(i) ==1)
            cout << i << " ";
    cout <<endl <<"Cerinta B: ";
int gasite=0,i=2;
while(gasite < N){
    if (Prim(i))
        gasite++;
        i++;
    cout << i << " ";
}

int N;
cin >> N;
cout << Nr_Cifre_pare(N);
*/
int main
return 0;
}