--------------------- 1.
int main()
{
int n,p=1;
cin>>n;
do{
if(n%10%2==0)
p*=n%10;
n/=10;
}while(n);
cout<<p;
}
--------------------- 2.
int main()
{
int n,k=0;
cin>>n;
do{
if(n/100%10<5)
k++;
cin>>n;
}while(n!=1);
cout<<k;
}
--------------------- 3.
int main()
{
int n,k=0;
cin>>n;
do{
if(n%10%2==0)
{
k++;
cout<<n%10<<" ";
}
n/=10;
}while(n);
cout<<endl<<k;
}
--------------------- 4.
int main()
{
int n,maxx=0,p=1;
cin>>n;
do{
if(n%10%2!=0)
p*=n%10;
if(n%10>maxx)
maxx=n%10;
n/=10;
}while(n);
cout<<maxx<<" "<<p;
}
--------------------- 5.
int main()
{
int n,s=0;
cin>>n;
do{
if(n%10%2==0)
s+=n%10;
n/=10;
}while(n);
cout<<s;
}