13353513454
shaoyouchen567
#include <bits/stdc++.h>
using namespace std;
long long s[3005],f[1000005];
int main(){
//freopen("foot.in", "r", stdin);
//freopen("foot.out", "w", stdout);
int n;
cin>>n;
for(int i=1;i<=n;i++){
cin>>s[i];
}
f[0]=1;
f[1]=1;
for(int i=2;i<=n;i++){
if(s[i]==s[i-1]){
f[i]=f[i-1];
}
else{
f[i]=f[i-1]+f[i-2];
f[i]%=1000000007;
}
}
cout<<f[n];
return 0;
}
