#include<iostream> #include<cstring> using namespace std; int main() { int u,v,w,c[5001]={0},len3,len2=1; cin>>u; for(v=1;v<=u;v++) { int a1[5001]; char a[5001]; cin>>a; int len1=strlen(a); for(int i=1;i<=len1;i++) a1[i]=a[len1-i]-'0'; int x=0; len3=1; while(len3<=len1) { c[len3]=a1[len3]+c[len3]+x; x=c[len3]/10; c[len3]%=10; len2++; len3++; } c[len3]=x; } for(int i=len2;i>=1;i--) { c[i]=c[i]*3+x; int x=0; if(c[i]>=10) { x+=c[i]/10; c[i]%=10; } } while(c[len2]==0&&len2>1) len2--; for(int i=len2;i>=1;i--) cout<<c[i]; return 0; }