# This is my first PYTHON program
n=int();
s=int();
i=int();
print('Please enter value for N\n');
n= int(input());
s=0;
for i in range (1, n, 1):
if i % 2 == 0 :
s=s+i;
print("\nCurrent value i=",i," S=",s);
print("Final result suma is S=", s);
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