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#include<fstream>
using namespace std;
ifstream fin("divk.in");
ofstream fout("divk.out");
int x[500005],s[500005],j;
int main()
{
int n,k,a,b;
fin>>n>>k>>a>>b;
int i;
for(i=1;i<=n;i++)
fin>>x[i];
for(i=1;i<=n;i++)
x[i]=x[i]%k;
for(i=1;i<=n;i++){
s[i]=s[i-1]+x[i];
s[i]=s[i]%k;}
unsigned long long nr=0;
for(i=1;i<=n;i++)
if(s[i]==0)
nr++;
fout<<nr;
}