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#include <bits/stdc++.h>
using namespace std;
long long n;
//chuongtrinhcon
int tongchuso(long long n)
{
int t=0;
while (n>0)
{
int x=n%10;
t=t+x;
n=n/10;
}
return(t);
}
//chuongtrinhchinh
int main()
{
freopen("sonut.inp","r",stdin);
freopen("sonut.out","w",stdout);
cin>>n;
int t=tongchuso(n);
while (t>10)
{
t=tongchuso(t);
}
cout<<t;
return 0;
}
#include <bits/stdc++.h>
using namespace std;
int main()
{
long a[105], i,n,max,vt;
cout<<"n="; cin>>n;
for (i=1; i<=n; i++)
{
cout<<"A["<<i<<"]="; cin>>a[i];
}
max=a[1];
for (i=1; i<=n; i++)
if (max<a[i]) max=a[i];
vt=1;
for (i=1; i<=n; i++)
if (max==a[i]) vt=i;
cout<<max<<endl;
cout<<vt;
return 0;
}
uses crt;
const fi='dt.inp';
fo='dt.out';
var n,i,d,x,t,ln,kt:integer;
st:string;
a:array[1..100]of integer;
f1,f2:text;
begin
clrscr;
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,n);
{-------------------------cau-a-----------------------}
str(n,st);
d:=length(st);
for i:=1 to d do
val(st[i],a[i],x);
t:=0;
for i:=1 to d do
begin
if a[i]=0 then t:=t+6;
if a[i]=1 then t:=t+2;
if a[i]=2 then t:=t+5;
if a[i]=3 then t:=t+5;
if a[i]=4 then t:=t+4;
if a[i]=5 then t:=t+5;
if a[i]=6 then t:=t+6;
if a[i]=7 then t:=t+3;
if a[i]=8 then t:=t+7;
if a[i]=9 then t:=t+6;
end;
writeln(f2,t);
{-----------------------cau-b---------------------------}
ln:=a[1];
for i:=1 to d do
if ln<a[i] then ln:=a[i];
writeln(f2,ln);
{--------------------cau-c-------------------------------}
kt:=0;
for i:=1 to d-1 do
if a[i]>a[i+1] then kt:=1;
if kt=0 then writeln(f2,'T')
else begin
kt:=0;
for i:=1 to d-1 do
if a[i]<a[i+1] then kt:=1;
if kt=0 then writeln(f2,'L')
else writeln(f2,'0');
end;
close(f1);
close(f2);
readln;
end.
uses crt;
var p:real;
begin
clrscr;
write('Nhap chu vi:'); readln(p);
writeln(sqr(p/4):4:2);
readln;
end.
N = int(input())
A = 0
B = 0
So_uoc = 0
KQ = ""
for x in range(1, N):
if (x%2==0) and (x%3==0):
A += 1
if (x>0) and (N%x==0):
if (x>B):
B = x
for i in range(1, N+1):
if (N%i==0):
So_uoc += 1
if (So_uoc == 2):
KQ = "YES"
else:
KQ = "NO"
print(A)
print(B)
print(len(str(N)))
print(KQ)
(Chẳng biết đúng không đâu 
)
uses crt;
var a:array[1..50]of int64;
i,n,t,max,min:int64;
begin
clrscr;
readln(n);
for i:=1 to n do
readln(a[i]);
max:=a[1];
min:=a[1];
t:=0;
for i:=1 to n do
begin
if max<a[i] then max:=a[i];
if min>a[i] then min:=a[i];
t:=t+a[i];
end;
writeln('Tong la: ',t);
writeln('So lon nhat la: ',max);
write('Vi tri la: ');
for i:=1 to n do
if a[i]=max then write(i:4);
writeln;
writeln('So nho nhat la: ',min);
write('Vi tri la: ');
for i:=1 to n do
if a[i]=min then write(i:4);
readln;
end.
#include <bits/stdc++.h>
using namespace std;
long long n;
int main()
{
cin>>n;
int ln=0;
while (n>0)
{
int x=n%10;
ln=max(ln,x);
n=n/10;
}
cout<<x;
}