C :

#include<stdio.h>
void main()
{
	int x,a,b,i,j,c=0;
	scanf("%d%d%d",&x,&a,&b);
	for(i=1;i<x/a;i++){
		j=(x-i*a)/b;
		if((x-i*a)%b==0&&i*a+j*b==x){
			c++;
		}
		
	}
	printf("%d",c);
}

C++ :

#include<iostream>
using namespace std;
int main(){ 
   int x,a,b,i,f=0;
   cin>>x>>a>>b;
   for(i = 1;i <= x / a;i++)
   { 
      if((x - i * a >= b) && (x - i * a) % b == 0 ){
      	f++;
	  }
   }
   cout<<f<<endl;
   return 0;
}

Python :

n = input().split()
x = int(n[0])
a = int(n[1])
b = int(n[2])
c = 0
for i in range(1, x // a + 1):
    for j in range(1, x // b + 1):
        if a * i + b * j == x:
            c += 1
print(c)