> const 
>   nv=100;
> type
>   r=record
>       vex1,vex2:1..nv;
>       w:longint;
>     end;
>   set1=set of 1..nv;
>   settype=array[1..nv] of set1;
> var
>   n,l,q,a,b:integer;
>   stev:settype;
>   ans:longint;
>   m:array[1..nv*nv] of r;
> procedure init;
> var
>   i,j:integer;
> begin
>   readln(n);
>   l:=0;
>   ans:=0;
>   for i:=1 to n do
>     begin
>       for j:=1 to n do
>         begin
>           inc(l);
>           m[l].vex1:=i;
>           m[l].vex2:=j;
>           read(m[l].w);
>         end;
>       readln;
>     end;
>   readln(q);
>   for i:=1 to q do
>     begin
>       readln(a,b);
>       m[(a-1)*n+b].w:=0;
>     end;
> end;
> procedure sort;
> var
>   i,j:integer;
>   k:r;
> begin
>   for i:=1 to l-1 do
>     for j:=i+1 to l do
>       if m[i].w>m[j].w then
>         begin
>           k:=m[i];
>           m[i]:=m[j];
>           m[j]:=k;
>         end;
> end;
> function find(var setv:settype;vex:integer):integer;
> var
>   i:integer;
> begin
>   i:=1;
>   while (i<=nv)and(not(vex in setv[i])) do inc(i);
>   if i<=nv then find:=i
>            else find:=0;
> end;
> procedure kruskal(var setv:settype);
> var
>   i,n,u,v,u1,v1,k:integer;
> begin
>   k:=1;
>   n:=nv;
>   for i:=1 to nv do setv[i]:=[i];
>   while (l>1)and(k<=l) do
>     begin
>       u:=m[k].vex1;
>       v:=m[k].vex2;
>       u1:=find(stev,u);
>       v1:=find(stev,v);
>       if u1<>v1 then
>         begin
>           inc(ans,m[k].w);
>           stev[u1]:=stev[u1]+stev[v1];
>           stev[v1]:=[];
>           dec(l);
>         end;
>       inc(k);
>     end;
> end;
> begin
>   while not eof do
>     begin
>       init;
>       sort;
>       kruskal(stev);
>       writeln(ans);
>     end;
> end.