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#include<stdio.h>
int main()
{
int n,s,num,x;
scanf("%d",&n);
s = n%10;
if(s>5)
{
x = 10 -s;
num = n+x;
printf("%d",num);
}
else
{
num = n - s;
printf("%d",num);
}
}
int main()
{
int n,s,num,x;
scanf("%d",&n);
s = n%10;
if(s>5)
{
x = 10 -s;
num = n+x;
printf("%d",num);
}
else
{
num = n - s;
printf("%d",num);
}
}
