#include<stdio.h>
#include<stdlib.h>
#define LL long long 
#define FORa(i,s,e) for(LL i=s;i<=e;i++)
#define FORs(i,s,e) for(LL i=s;i>=e;i--)
#define gc pa==pb&&(pb=(pa=buf)+fread(buf,1,100000,stdin),stdin)?EOF:*pa++
#define File(name) freopen(name".in","r",stdin);freopen(name".out","w",stdout);

using namespace std;
static char buf[100000],*pa=buf,*pb=buf;
inline LL read();

LL n,m,k,x;
LL Quickpow(LL a,LL b,LL c)
{
    LL ret=1;
    while(b)
    {
        if(b%2) ret=ret*a%c;
        a=a*a%c,b/=2; 
    }
    return ret%c;
}
int main()
{
    File("circle");
    n=read(),m=read(),k=read(),x=read();
    printf("%lld",(x+m*Quickpow(10,k,n))%n);
    return 0;
}
inline LL read()
{
    register LL f(1),x(0);register char c(gc);
    while(c<‘0‘||c>‘9‘) f=c==‘-‘?-1:1,c=gc;
    while(c>=‘0‘&&c<=‘9‘) x=(x<<1)+(x<<3)+(c^48),c=gc;
    return f*x;
}