Thank you very much for your prompt reply. I made it with css
.discount-percentage {
font-size: 1.4rem!important;
vertical-align: initial!important;
display: none!important;
}
.product-flags .discount, .product-flags .on-sale {
background: rgba(255,255,255,.57);
color: #fe5200;
display: none!important;
}
.product-discount .regular-price {
text-decoration: line-through;
padding: 0 0.2rem;
display: none!important;
}
.product-miniature-default .regular-price {
text-decoration: line-through;
display: none!important;
}