#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
typedef long long ll;
const ll p=1e9+7;
int o,k,ls,lp,cnt[250005];
ll ans,hshs[250005],hshp[250005],pw[250005];
char S[250005],P[250005];
void init(char S[],ll hsh[],int n){
    for(int i=1;i<=n;i++)
        hsh[i]=(hsh[i-1]*2+(S[i]=='o'))%p;
}
int solve(int i,int pos){
    int l=pos,r=lp,mid,res;
    while(l<=r){
        mid=(l+r)>>1;
        if(hshs[i+mid-1]-hshs[pos-1]*pw[lp]==hshp[mid]-hsh[pos-1]*)
            l=mid+1,res=mid;
        else
            r=mid-1;
    }
    return res;
}
int main(){
    ios::sync_with_stdio(false);
    int i,j,pos,l,r;
    cin>>o>>k>>S+1>>P+1;
    ls=strlen(S+1);
    lp=strlen(P+1);
    init(S,hshs,ls);
    init(P,hshp,lp);
    pw[0]=1;
    for(i=1;i<=ls;i++)
        pw[i]=(pw[i-1]<<1)%p;
    for(i=1;i<=ls;i++)
        cnt[i]=cnt[i-1]+(S[i]=='o');
    for(i=1;i<=ls-lp+1;i++){
        pos=1;
        for(j=1;j<=35&&pos<=lp;j++)
            pos=solve(i,pos)+1;
        ans=max(ans,(ll(cnt[i+lp-1]-cnt[i-1])*o+ll(lp-cnt[i+lp-1]+cnt[i-1])*k)>>j);
    }
    cout<<ans;
    return 0;
}

  File "answer.code", line 4
    using namespace std;
          ^^^^^^^^^
SyntaxError: invalid syntax