Problem:
Score : 100 points

Problem Statement

Takahashi is meeting up with Aoki.

They have planned to meet at a place that is D meters away from Takahashi's house in T minutes from now.

Takahashi will leave his house now and go straight to the place at a speed of S meters per minute.

Will he arrive in time?

Constraints

1 \leq D \leq 10000

1 \leq T \leq 10000

1 \leq S \leq 10000

All values in input are integers.

Input

Input is given from Standard Input in the following format:

D T S

Output

If Takahashi will reach the place in time, print Yes; otherwise, print No.

Sample Input 1

1000 15 80

Sample Output 1

Yes

It takes 12.5 minutes to go 1000 meters to the place at a speed of 80 meters per minute. They have planned to meet in 15 minutes so he will arrive in time.

Sample Input 2

2000 20 100

Sample Output 2

Yes

It takes 20 minutes to go 2000 meters to the place at a speed of 100 meters per minute. They have planned to meet in 20 minutes so he will arrive just on time.

Sample Input 3

10000 1 1

Sample Output 3

No

He will be late.

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

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

unsigned long int POW (unsigned long int n,unsigned long int x);
int main (void){
    unsigned long int mod = 1000000007;
    unsigned long long int print_ans=0;
    int x=0;
    int n;
    scanf("%d",&n);
    unsigned long int a[n+2];
    unsigned long long int ans[5];
    unsigned long long int temp1=0;
    unsigned long long int temp2=0;
    unsigned long long int temp3=0;
    unsigned long int num = 1000000000;
    ans[0]=0;
    for(int i=0;i<n;i++)
    scanf("%ld",&a[i]);

    for(int i=0;i<n;i++) temp3 += ((a[i]%mod)*(a[i]%mod))%mod;
    for(int i=0;i<n;i++) temp1 =  (temp1 + mod -a[i])%mod;

    unsigned long long int temp = POW(2,1000000005);
    temp2 = (temp1 * temp1 - temp3)%mod * temp*mod;

    print_ans = temp2;
    printf("%lld",print_ans);

    return 0;
}

unsigned long int POW (unsigned long int n,unsigned long int x){
    unsigned long int ans=0;
    for(int i=0;i<x;i++) ans *= 2;
}