#include <stdio.h> 
#include <math.h>

int main(void)
{
 int i,n;
 float x[100];   
 // Reading n from stdin
 scanf("%i", &n);
 // Reading n floats from stdin
 for(i=0;i<n;i++)
   {
   scanf("%f", x+i);
   };
 //Printing Header
 printf("i\tx_i\t\tCCos(x_i)\n");
 // printing body
 for(i=0;i<n;i++)
  {
  printf("%i\t%f\t%f\n",i, x[i], cosf(x[i]));
  };
 return 0;
}