#include<stdio.h>

int main()
{
   int per;
   while(1)
   {
    printf("Enter your percentage: ");
    scanf("%d", &per);
    if (per >= 100 || per<=0)
    {
            printf("Invalid percentage!\n Please retry.");
    }
    else
        break;
   }
   if (per >= 75) {
     printf("You have passed in distinction\n");
   }
   else if (per >= 60) {
     printf("You have passed in first class\n");
   }
   else if (per >= 50) {
     printf("You have passed in second class\n");
   }
   else if (per>= 40) {
     printf("you have passed in thrid class\n");
   }
   else if (per>= 35) {
     printf("You have passed\n");
   }
   else {
     printf("better luck next time\n");
   }
   return 0;
}