//As G is too small, m1 and m2 value should be big then only we have some visible force value

#include <stdio.h>
int main(){
 float F, m1,m2,r;
 float G=6.673e-11;
 printf("Enter m1 and m2 (big values):\n");
 scanf("%f %f",&m1,&m2);
 printf("Enter r: \n");
 scanf("%f",&r);

 F=(G*m1*m2)/(r*r);

 printf("F=%f  \n",F);
 return 0; 
}