The number of solutions of x1+x2+x3+x4=50 where x1,x2,x3,x4 are integers with x1≥1,x2≥2,x3≥0,x4≥0 is

Question

The number of solutions of x1​+x2​+x3​+x4​=50 where x1​,x2​,x3​,x4​ are integers with x1​≥1,x2​≥2,x3​≥0,x4​≥0 is