C :

#include<stdio.h>
void main()
{
	int a,b,c,i=0;
	for(a=1;a<100;a++){
		for(b=1;b<(100-a)/2;b++){
			c=(100-a-2*b)/5;
			if(a+2*b+5*c==100)
				i++;	
		}
	}
	printf("%d",i);
}

C++ :

#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

int main(){
     int a,b,c,s=0;
     for(a=1;a<=1*100/5;a++){
   	      for(b=1;b<=1*100/2;b++){
   	    	   for(c=1;c<=1*100/1;c++){
   	    	   	    if(a*5+b*2+c*1==1*100){
   	    	   	    	  s=s+1;
						  }
				  }
		   }
   }cout<<s<<endl;
}

Python :

b = 0
for i in range (1, 100):
   for m in range (1, 50):
       for n in range (1, 20):
         if i * 1 + 2 * m + n * 5 == 100 and i != 0 and m != 0 and n != 0:
            b += 1
print(b)