250507
/*
#include <stdio.h>
int main(){
int x,i,c=0;
scanf("%d",&x);
for(i=1;i<=x;i++)
{
if(i%2==0)
{
c=c+i;
}
}
printf("%d",c);
return 0;
}
*/
/*
#include<stdio.h>
int main(){
int i,c=0,e[10]={0},f;
for(i=1;i<=9;i++)
{
scanf("%d",&e[i]);
}
for(i=1;i<=9;i++)
{
if(e[i]>c)
{
c=e[i];
f=i;
}
}
printf("%d\n",c);
printf("%d",f);
return 0;
}
*/
/*
#include<stdio.h>
int main()
{
char str[100]={};
scanf("%s",&str[0]);
if(str[0] == 'I' && str[1] == 'O' && str[2] == 'I' && str[3] == NULL)
{
printf("IOI is the International Olympiad in Informatics.");
}
else{
printf("I don't care.");
}
return 0;
}
*/
/*
#include <stdio.h>
int n, m;
long long int f(int n,int m)
{
return (long long int)n+m;
}
int main()
{
scanf("%d%d", &n, &m);
printf("%lld\n", f(n, m));
}
*/
/*
#include<stdio.h>
int main()
{
int i,a,x=0,y=1000,b[1001]={};
scanf("%d",&a);
for(i=1;i<=a;i++)
{
scanf("%d",&b[i]);
if(x<b[i])
{
x=b[i];
}
if(y>b[i])
{
y=b[i];
}
}
printf("%d",x-y);
}
*/