nstime in for statement

i want to call a method in per 5 seconds. also there is a count and after 20 seconds if the count is equal to 4 then do something..like below code..

but I see, it writes NSLog(@"denemelik"); at every 5 second not after if cnt is 5. I think it must write the "denemelik" after 25 seconds because of if (cnt == 5 )

I hope you understand what I mean..Can you help me? How can I solve this problem?

for (int i=1; i<6; i++) {
    [NSTimer scheduledTimerWithTimeInterval: 5.0
                                     target: self
                                   selector:@selector(onTick:)
                                   userInfo: nil repeats:YES];
    cnt=i;

}


-(void)onTick:(NSTimer *)timer {
    if(timer)
{
    CLLocation *d =[[CLLocation alloc] init];
    ws6=[[GetData5 alloc]init];
    [ws6 GetWebservice5:@"123abc":d.coordinate.latitude:d.coordinate.longitude:0 :0:@"mesafe" ];
    NSMutableArray *arr = [[NSMutableArray alloc] init];        
    if (cnt == 5 ) 
        NSLog(@"denemelik");
    }
}
}

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