file_in = open('et.inp','r')
lines=[]
for line in file_in:
	lines.append(line)
file_in.close()

for i in range(-10,10):
	filename = 'et_'+str(i)+'.inp'
	file_out = open(filename,'w')
	for line in lines:
		if line.startswith('chv') == True :
			line = line.strip().split('=')
			chv = float(line[1])
			line = str(line[0])+'='+str(chv+0.02*i)+'\n'
			file_out.write(line)
		else :
			file_out.write(line)
	file_out.close()