10.20.1

#include<stdio.h>

int main()

{

int n,i,j,count=0;

scanf("%d\n",&n);

char arr[n+9];

gets(arr);

for(i=0;i<n-1;i++){

for(j=0;j<n-1-i;j++)

{if(arr[j]>arr[j+1])

{int temp;

temp=arr[j];

arr[j]=arr[j+1];

arr[j+1]=temp;  

}count++;

}}

printf("%d\n",count);

/* unsigned long long a,b,c;

scanf("%d%d%d",&a,&b,&c);

if(a%c!=0&&b%c!=0)

printf("%d",(a/c+(a%c)/(a%c))*(b/c+(b%c)/(b%c)));

else{if(a%c!=0&&b%c==0)

printf("%d",(a/c+(a%c)/(a%c))*(b/c));

else if(a%c==0&&b%c!=0)

printf("%d",(a/c)*(b/c+(b%c)/(b%c)));

else printf("%d",(a/c)*(b/c));

}*/

return 0;

}